Fix Python 3.14 compatibility in dirhash job count

[biofotis]

This PR is making the script compatible with python 3.14 that is used by default in Ubuntu resolute

[biofotis]

@ruffsl We fixed this in our fork but it will be needed for people working on latest ubuntu and Lyrical ros

[SteveMacenski]

We're experiencing this issue as well in Nav2 - I patched it in CI via

# Patch colcon-cache for Python 3.14 compatibility
pip install --break-system-packages --force-reinstall --no-deps git+https://github.com/ruffsl/colcon-cache.git@master
DIRHASH_FILE=$(python3 -c "import colcon_cache.task.lock.dirhash as m; print(m.__file__)")
sed -i 's/modifier_group = parser.add_mutually_exclusive_group()/modifier_group = parser/' "$DIRHASH_FILE"
sed -i 's/jobs = max(filter(None.__ne__, \[1, jobs\]))/jobs = max(j for j in (1, jobs) if j is not None)/' "$DIRHASH_FILE"