chore(dev): release languagetool-rust version 2.1.5

[okaerin]

Release a new version v2.1.5

Description

Check List (Check all the applicable boxes)

• I understand that my contributions needs to pass the checks.
• If I created new functions / methods, I documented them and add type hints.
• If I modified already existing code, I updated the documentation accordingly.
• The title of my pull request is a short description of the requested changes.

Screenshots

Note to reviewers

[okaerin]

@jeertmans During the release Process I noticed, that I need to adjust the RELEASE-PROCESS.md, as less steps are required. I will fix it with issue #132 This is fixed with #133

[codspeed-hq]

CodSpeed Performance Report

Merging #131 will not alter performance

_{Comparing okaerin:release-2.1.5 (f6ffff4) with main (3298c77)}

Summary

✅ 6 untouched benchmarks

[jeertmans]

Thanks for your contribution @okaerin, failing tests are not important and will by addressed in #117