[DOP-9653] Update Excel package version to 0.20.3

[dolfinus]

Change Summary

• Update spark-excel to 0.20.3
• Update Spark 3.4.1 to 3.4.2

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9df496e) 94.24% compared to head (41710aa) 94.22%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #187      +/-   ##
===========================================
- Coverage    94.24%   94.22%   -0.03%     
===========================================
  Files          204      204              
  Lines         7684     7684              
  Branches      1347     1347              
===========================================
- Hits          7242     7240       -2     
- Misses         328      329       +1     
- Partials       114      115       +1     

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