Use raw string for regex

[lochhh]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
With Python 3.12 we're getting the following SyntaxWarning, which will eventually become a SyntaxError:

tests\test_unit\test_validators\test_files_validators.py:97
SyntaxWarning: invalid escape sequence '\d'
"The provided frame regexp ((0\d*).\w+$) did not return "

What does this PR do?
This PR updates the affected test to use raw string for regex.

How has this PR been tested?

Tests pass locally without emitting SyntaxWarning.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality
• The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.86%. Comparing base (822a10f) to head (04fcff5).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #452   +/-   ##
=======================================
  Coverage   99.86%   99.86%           
=======================================
  Files          27       27           
  Lines        1462     1462           
=======================================
  Hits         1460     1460           
  Misses          2        2           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sfmig]

thanks @lochhh! ✨

[niksirbi]

I will use my admin perks to force-merge this. GitHub's CI hangup hasn't been resolved yet for some reason (it still tries to run CI on runners we've already removed).