CI: Update dependabot cfg and codeowners

[SMoraisAnsys]

Description

Follow up of this dependabot's message #6166 (comment)
The PR removes the field to be removed in dependabot's config file and extend CODEOWNERS application.

Issue linked

Related to #5524

Checklist

• I have tested my changes locally.
• I have added necessary documentation or updated existing documentation.
• I have followed the coding style guidelines of this project.
• I have added appropriate tests (unit, integration, system).
• I have reviewed my changes before submitting this pull request.
• I have linked the issue or issues that are solved by the PR if any.
• I have agreed with the Contributor License Agreement (CLA).

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.22%. Comparing base (82eb4bf) to head (14e423f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6169   +/-   ##
=======================================
  Coverage   85.22%   85.22%           
=======================================
  Files         169      169           
  Lines       64036    64036           
=======================================
+ Hits        54572    54575    +3     
+ Misses       9464     9461    -3     

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