Fix DAC1 API dimensions

[jm-rivera]

This pull request updates the DAC1 query filter logic and documentation to match a new schema, which adds the SECTOR dimension at position 2. It also bumps the DAC1 dataflow version to 1.8 and updates related documentation and tests to reflect these changes.

DAC1 filter and schema alignment:

• Updates the build_dac1_filter method in QueryBuilder to include the sector parameter as the second dimension, matching the new DSD schema. The filter pattern is now {donor}.{sector}.{measure}.{tying_status}.{flow_type}.{unit_measure}.{price_base}. [1] [2] [3]
• Updates all relevant tests in test_query_builder.py to use the new filter string format with the SECTOR dimension in the correct position. [1] [2]
• Updates documentation (advanced.md) to reflect the new dimension order and method signature for build_dac1_filter. [1] [2]

Version bumps:

• Bumps the DAC1 dataflow version from 1.7 to 1.8 in dac1.py.
• Updates the package version to 1.4.3 in pyproject.toml.
• Adds a changelog entry for version 1.4.3, describing the schema change and version bump.