Upgrade Arcmutate plugins

[Stephan202]

Suggested commit message:

Upgrade Arcmutate plugins (#1586)

These upgrades were not picked up automatically due to a groupId change.

Summary of changes:
- Upgrade Pitest Git plugins 1.1.4 -> 2.1.0
- Upgrade Arcmutate 1.2.2 -> 1.3.2
- Upgrade pitest-accelerator-junit5 1.0.6 -> 1.2.0

Hat tip to @jqno for his instructions here. Based on local testing I shouldn't rename the license file, but let's see what GitHub Actions thinks 👀

(Tested before and after results: no changes except that on this line there's now a surviving mutant instead of a MEMORY_ERROR mutant ✔️.)

[mohamedsamehsalah]

🏹

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Stephan202]

With this change the posting of PR mutation changes is broken, but I suspect that this is because part of the logic is executed based on code on master. Let's merge this and see whether that fixes stuff. If not, I'll go debug.

[Stephan202]

Let's merge this and see whether that fixes stuff.

Worked; see #1592.

Based on local testing I shouldn't rename the license file, but let's see what GitHub Actions thinks 👀

It appears that indeed things still work as expected. Post-merge build logs show that the license file is still picked up:

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 
Licenced for use in the development of open source software only.
Expires: 2025-10-27
For use with packages: tech.picnic.errorprone.*
See https://www.arcmutate.com
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 

[Stephan202]

W.r.t. the license file: follow-up in #1594.