[ci] chore(workflow): add solved label and correct milestone to issue when PR is merged (#252)

[ncarenton]

Proposed changes

• Add solved and correct milestone to issue when PR is merged

Related issues

• Closes: [ci] Automatically add "solved" label and correct milestone to issue when PR is merged #252

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.34%. Comparing base (fd74768) to head (ca61f51).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #253   +/-   ##
=======================================
  Coverage   70.34%   70.34%           
=======================================
  Files          49       49           
  Lines        1966     1966           
=======================================
  Hits         1383     1383           
  Misses        583      583           

Flag	Coverage Δ
connectors	70.34% <ø> (ø)

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