[Merge] ~calvinmwadime/ubuntu-release-upgrader:fix_invalid_escape_sequence into ubuntu-release-upgrader:ubuntu/main

[Calvin Mwadime Makokha]

Calvin Mwadime Makokha has proposed merging ~calvinmwadime/ubuntu-release-upgrader:fix_invalid_escape_sequence into ubuntu-release-upgrader:ubuntu/main.

Commit message:
fix(regex): fix invalid escape sequence error
Python 3.12 raises an SyntaxWarning about the invalid escape sequence when installing the package.



Requested reviews:
  Ubuntu Core Development Team (ubuntu-core-dev)

For more details, see:
https://code.launchpad.net/~calvinmwadime/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/463497
-- 
Your team Ubuntu Core Development Team is requested to review the proposed merge of ~calvinmwadime/ubuntu-release-upgrader:fix_invalid_escape_sequence into ubuntu-release-upgrader:ubuntu/main.
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