Fix regex for var allowed_deserialization_classes

[pankajastro]

AstroSDK test seem to be failing on below PR
PR: #2124
CI Job: https://github.com/astronomer/astro-sdk/actions/runs/8158059156/job/22301955847?pr=2124

[tatiana]

Thanks for the fix! Happy for this to be merged once tests are passing, @pankajastro !

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.14%. Comparing base (e4222cb) to head (6b8e941).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2125      +/-   ##
==========================================
- Coverage   90.16%   89.14%   -1.02%     
==========================================
  Files          75       75              
  Lines        4322     4322              
  Branches      539      539              
==========================================
- Hits         3897     3853      -44     
- Misses        325      366      +41     
- Partials      100      103       +3     

Flag	Coverage Δ
PythonSDK	89.14% <ø> (-1.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.