chore(deps): update plugin org.jreleaser to v1.21.0 (#85)

This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| org.jreleaser | `1.20.0` -> `1.21.0` |
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|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/maven/org.jreleaser:org.jreleaser.gradle.plugin/1.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/maven/org.jreleaser:org.jreleaser.gradle.plugin/1.20.0/1.21.0?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
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|

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gradle.properties

@@ -23,7 +23,7 @@ kotlin.code.style=official
 ## Dependency versions
 
 ### plugins
-jreleaserVersion=1.20.0
+jreleaserVersion=1.21.0
 kotlinVersion=2.2.21
 kotlinxVersion=1.10.2
 detektGradlePluginVersion=1.23.8