Fix invalid escape sequence warning

[mvdwetering]

Proposed change

I noticed this warning in Home Assistant logs when running master.

2025-04-25 20:48:18.373 WARNING (ImportExecutor_0) [py.warnings] /config/custom_components/mikrotik_router/coordinator.py:1584: SyntaxWarning: invalid escape sequence '\.'
  version = re.sub("[^0-9\.]", "", full_version[0:split_end])

Using raw string for the regex fixes the warning.

Type of change

• Bugfix
• New feature
• Code quality improvements to existing code or addition of tests
• Documentation

Additional information

Checklist

• The code change is tested and works locally.
• The code has been formatted using Black.
• Tests have been added to verify that the new code works.
• Documentation added/updated if required.

[mvdwetering]

The linting fails on unrelated code.
Unclear why it triggers now and not when that code originally got merged.

edit: Fixed the typehint also...

[mvdwetering]

Hassfest check is failing because of missing translations and order of keys in manifest.json. Not going to fix those because really out of scope for this fix.

Security check is probably failing because the bandit configuration does not exist (anymore?)

Because of all these errors I get the impression I am using the wrong source branch, but as far as I can see it is correct. Not sure why all is failing for this tiny change.