chore: relax click upper bound to <9

[ShadowA7X]

Summary

Relax the click upper bound from <8.2 to <9.

preset-cli 0.3.10–0.3.12 declare click>=8.0.3,<8.2, while dbt-core 1.11.x requires click>=8.3.0,<9.0. The two can't be installed in the same environment, so users of both can't upgrade either one. pip install preset-cli==0.3.12 dbt-core==1.11.15 fails with ResolutionImpossible.

Why the cap was there

The cap was added in #355 because click 8.2 changed command naming: it now strips the suffixes _command, _cmd, _group and _grp from a decorated function's name. Only one test fixture depended on this, so the product code is unaffected.

Changes

• setup.cfg: click>=8.0.3,<8.2 → click>=8.0.3,<9
• tests/cli/superset/main_test.py: the fixture command now sets its name explicitly (@click.command(name="source-command")), so the test passes on every click version
• dev-requirements-3.{10,11,12}.txt: click==8.1.8 → click==8.5.0, so the pinned-dependency CI job exercises the newer click
• CHANGELOG.rst: entry added under "Next"

Testing

On Python 3.11:

• Full test suite passes on both click 8.1.8 and 8.5.0 (708 tests, 100% coverage)
• pre-commit run --all-files passes
• I compared the --help output of every preset-cli and superset-cli command across click 8.1.8, 8.3.3 and 8.5.0, and it is identical. The parsed values of the delete-assets flags (including --dry-run / --no-dry-run) and of sync native are also identical, both directly and through mutate_commands
• With this change, preset-cli installs alongside dbt-core==1.11.15 (pip resolves click 8.5.0)

I have not run the 3.10 and 3.12 jobs locally, so CI will be the first run of those.

Things to be aware of

• Since click 8.2, running preset-cli or superset-cli with no arguments prints the help and exits with code 2 instead of 0. This is click's behavior, not something changed here.
• Click 9.0 is not released yet. The repo's only use of an API click has deprecated for 9.0 is CliRunner.isolated_filesystem() in tests/cli/export_users_test.py. It still works on 8.x, and I left it alone to keep this PR small, so the <9 cap stays.

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