mutmut-v3.5.1

chore(mutmut-fork): bump fork to 3.5.1, fix wheel glob for renamed dist

Vendor template was already renamed to `interlocks-mutmut` in e96d681 but the
release workflow's wheel-glob still expected the old `interlock_mutmut-*.whl`
filename, so the next tag push would break at the artifact-validation step.

Bumps the fork to 3.5.1 because PyPI already holds `interlock-mutmut==3.5.0`
under the old name; same upstream SHA, distribution metadata only. Tagging
mutmut-v3.5.1 publishes `interlocks-mutmut==3.5.1` to PyPI; the consumer-side
pin migration follows in a separate commit so the runtime resolver only flips
to the new name once the artifact is available.