Retract previously opened Pull Request

[mzuehlke]

The updates.retraced section of the scala-steward.conf allows to declare updates that should be retracted. Each entry must have a reason, a doc URL and a list of dependency patterns.

Example:

updates.retracted = [
  {
    reason = "Ignore version 3.6.0 as it is abandoned due to broken compatibility",
    doc = "https://contributors.scala-lang.org/t/broken-scala-3-6-0-release/6792",
    artifacts = [
      { groupId = "org.scala-lang", artifactId = "scala3-compiler", version = { exact = "3.6.0" } }
    ]
  }
]

Retraction of Pull Request is only possible, if the workspace is persisted correctly. (https://github.com/scala-steward-org/scala-steward/blob/main/docs/faq.md#why-doesnt-self-hosted-scala-steward-close-obsolete-prs)

Fixes: #3445

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 20 lines in your changes missing coverage. Please review.

Project coverage is 89.67%. Comparing base (916c6a1) to head (e6131eb).

Files with missing lines	Patch %	Lines
...ala/org/scalasteward/core/nurture/NurtureAlg.scala	0.00%	12 Missing ⚠️
...org/scalasteward/core/application/StewardAlg.scala	0.00%	6 Missing ⚠️
...lasteward/core/nurture/PullRequestRepository.scala	87.50%	1 Missing ⚠️
...alasteward/core/repoconfig/RetractedArtifact.scala	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3488      +/-   ##
==========================================
- Coverage   90.07%   89.67%   -0.41%     
==========================================
  Files         170      171       +1     
  Lines        3497     3526      +29     
  Branches      320      357      +37     
==========================================
+ Hits         3150     3162      +12     
- Misses        347      364      +17     

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