Update dependency org.pitest:pitest-junit5-plugin to v1.2.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.pitest:pitest-junit5-plugin (source)	1.2.0 -> 1.2.1

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Release Notes

pitest/pitest-junit5-plugin (org.pitest:pitest-junit5-plugin)

### [`v1.2.1`](https://togithub.com/pitest/pitest-junit5-plugin/compare/1.2.0...1.2.1) [Compare Source](https://togithub.com/pitest/pitest-junit5-plugin/compare/1.2.0...1.2.1)

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