Upgrade Checkstyle 10.5.0 -> 10.6.0

[Picnic-Bot]

This PR contains the following updates:

Package	Type	Update	Change
com.puppycrawl.tools:checkstyle (source)	build	minor	10.5.0 -> 10.6.0

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[github-actions]

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[github-actions]

Looks good. No mutations were possible for these changes.
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[github-actions]

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[Stephan202]

@rickie also no suggested commit message here 🤔

Proposal:

Upgrade Checkstyle 10.5.0 -> 10.6.0 (#435)

See:
- https://checkstyle.sourceforge.io/releasenotes.html
- https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-10.6.0
- https://github.com/checkstyle/checkstyle/compare/checkstyle-10.5.0...checkstyle-10.6.0

[rickie]

Checked out the pods for Renovate and something is wrong there. Opened a thread in the team channel :).

[rickie]

Do we want to do something with the JavadocStyleCheck? Verifying the first sentence is proper punctuation and all sounds good to me.

[github-actions]

Looks good. No mutations were possible for these changes.
Mutation testing report by Pitest. Review any surviving mutants by inspecting the line comments under Files changed.

[Stephan202]

Do we want to do something with the JavadocStyleCheck? Verifying the first sentence is proper punctuation and all sounds good to me.

Yes, SGTM too, so go for it :)

(Eventually we should auto-fix such thing with Error Prone, but this is a low-effort first step.)

[rickie]

Opened a PR: #451.