Drop Python 3.10 support after its EOL (October 2026)

[jacalata]

Python 3.10 reaches end-of-life on 2026-10-04. Once that lands, we should drop support and clean up the workarounds it forces.

Changes required after dropping 3.10

pyproject.toml:

• Bump requires-python from >=3.10 to >=3.11.
• Remove the "Programming Language :: Python :: 3.10" classifier.
• Drop tomli from the [docs] extra (backport for 3.10's missing tomllib).
• Remove py310 from Black's target-version.
• Remove typing_extensions>=4.0 from runtime dependencies if the Self cleanup below removes the last consumer.

docs/conf.py:

• Replace the try: import tomllib / except ImportError: import tomli as tomllib fallback with a direct import tomllib.

tableauserverclient/ — typing_extensions.Self becomes typing.Self in ~10 files (grep-confirmed):

• models/collection_item.py
• models/extensions_item.py
• models/groupset_item.py
• models/group_item.py
• models/reference_item.py
• models/user_item.py
• server/endpoint/endpoint.py
• server/endpoint/jobs_endpoint.py
• server/query.py

CI (.github/workflows/run-tests.yml): remove '3.10' from the test matrix.

Timing

Aim to file in a release published after 2026-10-04.

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