build(deps-dev): bump holoviews from 1.20.2 to 1.21.0

[dependabot]

Bumps holoviews from 1.20.2 to 1.21.0.

Release notes

Sourced from holoviews's releases.

Version 1.21.0

This release adds support for sample information on hover for rasterized/datashaded plots, adds dendrogram plot, and adds logarithmic support for Histogram. Along with these new features, this release includes a number of enhancements, bug fixes, and improved documentation. Many thanks to the new contributors @​philipc2, @​NolanBrb, and @​sand-hanitizer, as well as the returning contributors @​Azaya89, @​LecrisUT, @​maximlt, @​michaelaye, @​philippjfr, and @​hoxbro.

This release bumps the minimum supported Python version to 3.10, deprecates the streamz interface, autoloading RC file, IPython magic, and using matplotlib as default backend for hv.extension which are all planned for removal in 1.23.0.

New features:

• Sample information on hover for rasterized/datashaded Bokeh plot (#6422, #6479, #6531, #6553, #6568, #6581, #6584, #6593, #6596, #6609)
• Add dendrogram plot (#6511, #6625, #6600)
• Add logarithmic support for Histogram (#6575)

Deprecations and removals:

• Minimum supported Python version is now 3.10 (#6549)
• Deprecate the streamz interface (planned removal in 1.23.0) (#6490)
• Deprecate autoloading RC file (planned removal in 1.23.0) (#6610)
• Deprecate IPython magic (planned removal in 1.23.0) (#6610)
• Deprecate hv.extension() for hv.extension("matplotlib") (planned removal in 1.23.0) (#6610)
• Remove unused hv.config parameters: future_deprecations and warn_options_call (#6610)

Enhancements:

• [Bokeh] Add hide_toolbar options (#6602)
• [Bokeh] Add radius and radius_dimension to Point plot (#6599, #6613)
• [Notebook] Add details option for AbbreviatedException (#6611)
• [Notebook] Improve the content displayed when loading the extension in a notebook (#6586)
• Add basic reactive expression support in a streams dictionary (#6563)
• Allow passing dimension as style mapping option #6614
• Support passing selection dictionary to Dataset.select (#6617, #6626)
• Pass the backend in holoviews.opts.defaults (#6331)
• Update norm function to handle edge case (#6366)

Performance:

• Defer Pandas import (#6476, #6574, #6582, #6585)
• Defer datashader.bundling to avoid numba compile time (#6616)
• Defer Panel and Pandas imports in IPython (#6570)

Fixes:

• Correctly apply Bars style transforms (#6623)
• Don't assume all extents are string in max_extents (#6571)
• Histogram error with datatype dask.array and backend Matplotlib (#6542)
• Wrong empty element when using apply_when (#6628)
• Add legend to distribution for matplotlib backend (#6544)
• Improve multi_y error for single element (#6543)
• PandasInterface.select with an index and a column (#6579)
• Skip overlay aggregate for NdOverlays with a count aggregator (#6619)

... (truncated)

Changelog

Sourced from holoviews's changelog.

Version 1.21.0

June 25, 2025

This release adds support for sample information on hover for rasterized/datashaded plots, adds dendrogram plot, and adds logarithmic support for Histogram. Along with these new features, this release includes a number of enhancements, bug fixes, and improved documentation. Many thanks to the new contributors @​philipc2, @​NolanBrb, and @​sand-hanitizer, as well as the returning contributors @​Azaya89, @​LecrisUT, @​maximlt, @​michaelaye, @​philippjfr, and @​hoxbro.

This release bumps the minimum supported Python version to 3.10, deprecates the streamz interface, autoloading RC file, IPython magic, and using matplotlib as default backend for hv.extension which are all planned for removal in 1.23.0.

New features:

• Sample information on hover for rasterized/datashaded Bokeh plot ( #6422, #6479, #6531, #6553, #6568, #6581, #6584, #6593, #6596, #6609)
• Add dendrogram plot (#6511, #6625, #6600)
• Add logarithmic support for Histogram (#6575)

Deprecations and removals:

• Minimum supported Python version is now 3.10 (#6549)
• Deprecate the streamz interface (planned removal in 1.23.0) (#6490)
• Deprecate autoloading RC file (planned removal in 1.23.0) (#6610)
• Deprecate IPython magic (planned removal in 1.23.0) (#6610)
• Deprecate hv.extension() for hv.extension("matplotlib") (planned removal in 1.23.0) (#6610)
• Remove unused hv.config parameters: future_deprecations and warn_options_call (#6610)

Enhancements:

• [Bokeh] Add hide_toolbar options (#6602)
• [Bokeh] Add radius and radius_dimension to Point plot (#6599, #6613)
• [Notebook] Add details option for AbbreviatedException (#6611)
• [Notebook] Improve the content displayed when loading the extension in a notebook (#6586)
• Add basic reactive expression support in a streams dictionary (#6563)
• Allow passing dimension as style mapping option #6614
• Support passing selection dictionary to Dataset.select (#6617, #6626)

... (truncated)

Commits

• 0541eae docs: Changelog 1.21.0 (#6640)
• c0eaa62 docs: Add docs fixes (#6641)
• f84a5d3 compat: cuDF 25.06 (#6642)
• e419190 docs: Join assets directories (#6639)
• 8fe26ab chore: Update ruff to 0.12.0 (#6627)
• 81c92a5 enh: Add invert_dendrogram option to dendrogram operation (#6625)
• 408094c ci: Reset cloudfront doing docs publish (#6633)
• 8d0d933 docs: Reduce warnings after docs build (#6603)
• d2c97c4 enh: Allow passing dimensions in Dataset.select dictionary (#6626)
• c90fd4e fix: Wrong empty element when using apply_when (#6628)
• Additional commits viewable in compare view

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[dependabot]

Looks like holoviews is up-to-date now, so this is no longer needed.