Update altair requirement from >=4.1.0 to >=6.0.0

[dependabot]

Updates the requirements on altair to permit the latest version.

Release notes

Sourced from altair's releases.

v6.0.0

Release v6.0.0

The Vega-Altair team is pleased to announce the release of version 6.0.0. Firstly, we are grateful for the many returning contributors (@​franzhaas, @​dangotbanned, @​dsmedia, @​joelostblom, @​tempdata73, @​mattijn, @​jonmmease, @​eitanlees, @​kurtmckee, @​MarcoGorelli), and a special shoutout to all the new contributors (@​JasonnnW3000, @​edmundmiller, @​jannisko, @​stanmart, @​star1327p, @​baldwint, @​daizutabi, @​azjps, @​joaopalmeiro, @​bobot). You are all awesome!

In short what is included with the version 6 release of Altair.

• we now compile against Vega-Lite version 6 (to be specific, version 6.1.0) and provide support for Python 3.14.
• we have a new datasets module, altair.datasets, lazily access to datasets from https://github.com/vega/vega-datasets.
• we are now thread-safe, altair specifications should be stable after re-running.
• we improved docs and included new examples, eg. this faceted choropleth of habitat species across geographical counties https://altair-viz.github.io/gallery/maps_faceted_species.html.
• we improved the typing experiences.
• we migrated to uv as part of the infrastructure modernization and now have automated weekly builds.

We test all changes thoroughly, but nevertheless, if you encounter any issue or like to start a discussion. Please feel free!

Full details are available in the complete changelog below.

Breaking

• feat: Bump vega-lite>=6 by @​franzhaas in vega/altair#3831

Enhancements

• feat: Show python types in ValidationError messages by @​dangotbanned in vega/altair#3735
• feat: Update vega-lite to 5.21.0 by @​dangotbanned in vega/altair#3761
• feat: Show user_rows in MaxRowsError message by @​dangotbanned in vega/altair#3768
• feat: Allow numpy scalars in altair expressions by @​stanmart in vega/altair#3827
• feat: adds altair.datasets by @​mattijn in vega/altair#3848
• feat: preserve the empty property for the three operators (&, |, ~) by @​mattijn in vega/altair#3853
• feat: hashing of parameter and view names by @​mattijn in vega/altair#3851
• feat: Allow opening the editor without validating the spec by @​joelostblom in vega/altair#3869
• feat: require minimal vegafusion 2 and revert #3857 by @​mattijn in vega/altair#3885
• feat: add warning for deduplications by @​mattijn in vega/altair#3902

Bug Fixes

• fix(typing): Resolve LSP violation for ChartType.data by @​dangotbanned in vega/altair#3740
• fix: Replace circular import in schemapi.py by @​dangotbanned in vega/altair#3751
• fix: Include *(Datum|Value) in SchemaValidationError by @​dangotbanned in vega/altair#3750
• fix: Resolve multiple sphinx warnings by @​dangotbanned in vega/altair#3787
• fix(typing): overload in eval_block incorrectly showed True as the default for strict by @​MarcoGorelli in vega/altair#3855
• fix: import TypedDict from typing from python 3.15 by @​mattijn in vega/altair#3877
• fix: update typing_extensions dependency for Python < 3.15 by @​daizutabi in vega/altair#3881
• fix: Make .changed property optional in JupyterChart #3868 by @​azjps in vega/altair#3871
• fix(types): Change the height and width types of alt.Chart() from int to float by @​joaopalmeiro in vega/altair#3888
• fix: Repair vega export by @​bobot in vega/altair#3889

Documentation

• docs: Update LICENSE, fix copyright license year by @​JasonnnW3000 in vega/altair#3726
• docs: Add altair-upset link by @​edmundmiller in vega/altair#3786
• docs(example): Adds Confidence Interval Ellipses by @​dangotbanned in vega/altair#3747
• docs: Resolve geopandas.read_file(...) warnings by @​dangotbanned in vega/altair#3795
• docs: bump pyscript==2025.2.2 by @​dangotbanned in vega/altair#3797
• docs: fix broken links by @​jannisko in vega/altair#3802
• docs(example): Add Faceted map using Species Habitat dataset by @​dsmedia in vega/altair#3809
• docs: Add documentation for initial interval selection date ranges by @​dsmedia in vega/altair#3815

... (truncated)

Commits

• 8693285 chore: v6 release branch (#3912)
• f23c1c8 make sure artifact in weekly build contains data (#3911)
• 65c2c7f add pypi development release to weekly build (#3910)
• 11e3146 extra workflow to test free-threaded python (#3907)
• 6ff27ce fix: Repair vega export (#3889)
• 6fd632b add warning for deduplications (#3902)
• 8195839 ci: include python 3.14 rc3 to the GitHub action matrix (#3876)
• d9ce7ab docs: Correct some typos (#3904)
• 0f79cd8 improve body of weekly build (#3901)
• 94e783e ci: Test with minimum Narwhals version, bump minimum typing-extensions to 4.1...
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