feat: update Qt-Advanced-Docking-System to 5.1.1, drop py3.9, test on 3.14/3.15

[tlambert03]

Closes #24

Qt-Advanced-Docking-System 5.1.1

• Update submodule to the upstream v5.1.1 tag
• Upstream ads_globals.h now #includes ads_version.h, which is generated by CMake (and src.pro was removed). project.py now generates it from cmake/modules/ads_version.h.in into the sip build dir, using the version in the top-level CMakeLists.txt.
• Bind the new CAutoHideSideBar.wheelEvent override (the only public header API change between 5.0.0 and 5.1.1), with a test
• Add %MinimumABIVersion "13": sip >= 6.16 errors without it (ABI v13 is being targeted but the PyQt6Ads._ads module doesn't support it). CI wasn't hitting this because the cp39 build env resolved sip 6.14 (sip >= 6.15 requires Python >= 3.10), but local builds on newer Python were broken. The directive is supported by sip 6.10+, and the targeted ABI is unchanged (pyqtbuild still picks 13.8).
• Bump version to 5.1.1

Python support

• Drop Python 3.9 (requires-python >= 3.10, ruff target py310)
• Build the abi3 wheel on cp310 and test it on cp310, cp314 and cp315 (cibuildwheel reuses the abi3 wheel and runs the tests on each version)
• Upgrade cibuildwheel from v2.22 to v4.2 (needed for 3.14/3.15). v4 also runs abi3audit --strict on abi3 wheels by default, and our wheels pass it.
• Set repair-wheel-command = "" on Windows: cibuildwheel 4 made delvewheel the default there, which tries to bundle the Qt DLLs (Unable to find library: qt6widgets.dll). Qt comes from PyQt6-Qt6, so we keep the previous no-repair behavior.
• Add Python version classifiers (3.10–3.15)
• Fix a pytest deprecation warning (passing a generator to parametrize)

Testing

• CI: all 15 tests pass on 3.10, 3.14 and 3.15 on Linux, Windows, macOS arm64 and macOS Intel
• Locally (macOS arm64, Qt 6.5.3, sip 6.16.1): the wheel builds and all tests pass on 3.13, 3.14 and 3.15

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