[Enhancement] Prepare for SyntaxWarning

[elpekenin]

Description

Is not really an issue yet, but invalid escape sequences, eg '\[' will throw a SyntaxWarning on newer versions of Python. To avoid them i've looked through lib/python and fixed the faulty ones i could find.

Used git diff to check the output of both changes and didn't seem to affect functionality.

PS: Saw a couple places with stuff like '\\\\' which could become r'\\', but decided not to make more changes than strictly needed.

PS2: Bux could've been fixed by '\B' -> '\\B' but i decided to make it a r"" to change the '\\"' and get the right border to align

Types of Changes

• Core
• Bugfix
• New feature
• Enhancement/optimization
• Keyboard (addition or update)
• Keymap/layout/userspace (addition or update)
• Documentation

Issues Fixed or Closed by This PR

Checklist

• My code follows the code style of this project: C, Python
• I have read the PR Checklist document and have made the appropriate changes.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• I have tested the changes and verified that they work and don't break anything (as well as I can manage).

[github-actions]

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[elpekenin]

Busy week + internet was down for most part of it. Sorry for the delay

I think i've fixed everything now, running a diff is a bit painful because the build_log changing from a run to the next, but seems like the output makefile is indeed identical other than that 👍