Avoid workflows canceling each other out

[gerzse]

Pull Request check-list

• Do tests and lints pass with this change?
• Do the CI tests pass with this change (enable it first in your forked repo and wait for the github action build to finish)?
• Is the new or changed code fully tested?
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?
• Is there an example added to the examples folder (if applicable)?
• Was the change added to CHANGES file?

Description of change

Refine the concurrency definitions in the GitHub workflows, to avoid one workflow canceling others in the same CI run.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.80%. Comparing base (2f88840) to head (8095cc5).
Report is 18 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3183      +/-   ##
==========================================
- Coverage   91.84%   91.80%   -0.04%     
==========================================
  Files         128      128              
  Lines       33232    33328      +96     
==========================================
+ Hits        30523    30598      +75     
- Misses       2709     2730      +21     

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