[red-knot] mypy_primer: do not specify Python version (#17200)
## Summary
* Pull in latest changes from upstream (which includes an update to a
`pyproject.toml` layout and a `uv.lock` file, which should make CI more
deterministic)
* Do not specify `--python-version 3.13` in Red Knot runs
https://github.com/astral-sh/mypy_primer/compare/add-red-knot-support-v2...astral-sh:mypy_primer:add-red-knot-support-v3
## Test Plan
Tested locally
