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Closes #581 by updating locked versions of deps with C extensions to include 3.12 wheels. To do so, drop Python 3.7 support. This has EOLed, and without it Poetry refuses to update cffi (whose most recent release requirses Python >= 3.8).
Also pin the python version used in CI. To do so, inline the config that we pulled in from https://github.com/matrix-org/backend-meta/blob/release/v2/.github/workflows/python-poetry-ci.yml. (That doesn't expose an option to pin the Python version, and we haven't used that workflow anywhere else, really.)
Commitwise reviewable.