overrides: update build system for propcache

[davejames]

python versions <= 3.11 require tomli at build
https://github.com/aio-libs/propcache/blob/f5ba26cc63f4069473cf322c1b1c1924dec941de/pyproject.toml#L8

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"

Incorrectly accepted

[davejames]

@cpcloud rebased and resolved conflicts. the macos-13 test now passes too