Upgrade Checkstyle 10.12.5 -> 10.12.6

[Picnic-Bot]

This PR contains the following updates:

Package	Type	Update	Change
Checkstyle (source)	build	patch	10.12.5 -> 10.12.6

---

• If you want to rebase/retry this PR, check this box

[Picnic-Bot]

Suggested commit message:

Upgrade Checkstyle 10.12.5 -> 10.12.6 (#911)

See:
- https://checkstyle.sourceforge.io/releasenotes.html
- https://github.com/checkstyle/checkstyle/releases/tag/checkstyle-10.12.6
- https://github.com/checkstyle/checkstyle/compare/checkstyle-10.12.5...checkstyle-10.12.6

[Stephan202]

This means we can also simplify the CheckStyle integration test for macOS :)

[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.

[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.

[rickie]

I'm curious what the result of running the integration test is right now.

[rickie]

/integration-test

[rickie]

After they release 10.12.7 the init patch will be shorter as they use EPS from then 🤞🏻 .

[sonarqubecloud]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[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.

[rickie]

And it will work on my machine because of this one: checkstyle/checkstyle#14131.