fix(logger): exclude source_logger in copy_config_to_registered_loggers

[houbie]

#999

Description of changes:

The source_logger was not added correctly to the exclusions.

Checklist

• Meet tenets criteria
• Update tests
• Update docs
• PR title follows conventional commit semantics

Breaking change checklist

RFC issue #:

• Migration process documented
• Implement warnings (if it can live side by side)

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[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.

[codecov-commenter]

Codecov Report

Merging #1001 (8b61e39) into develop (168ec48) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           develop    #1001   +/-   ##
========================================
  Coverage    99.96%   99.96%           
========================================
  Files          119      119           
  Lines         5347     5347           
  Branches       610      610           
========================================
  Hits          5345     5345           
  Partials         2        2           

Impacted Files	Coverage Δ
aws_lambda_powertools/logging/utils.py	100.00% <100.00%> (ø)

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[heitorlessa]

@houbie thank you so much for fixing it so quickly! <3

[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!