fix(overrides): migrate pycairo to meson-python (and fix dependencies)

[jonathan-conder]

Contribution checklist (recommended but not always applicable/required):

• There's an automated test for this change
• Commit messages or code include references to related issues or PRs (including third parties)
• Commit messages are conventional - examples from the log include "feat: add changelog files to fixup hook", "fix(contourpy): allow wheel usage", and "test: add sqlalchemy2 test"

Explanation:

• pycairo uses meson-python as of 1.27.0.
• meson-python has basically always required meson and ninja. It also depends on pyproject-metadata but that seems to work without overrides.
• pyproject-metadata uses flit-core as of 0.8.0.

[jonathan-conder]

Turns out I accidentally added meson-python to my pyproject.toml - so the first 2 commits aren't needed to build pycairo. I'll leave them here for now though

[adisbladis]

Turns out I accidentally added meson-python to my pyproject.toml - so the first 2 commits aren't needed to build pycairo. I'll leave them here for now though

What does this mean? That inputs are added despite not being needed?

[jonathan-conder]

The inputs are needed if you have meson-python and/or pyproject-metadata in [tool.poetry.dependencies]. But they aren't needed if they only appear in [build-system].

So in hindsight, those commits should have been a separate PR.