build(deps): bump kotlin from 2.3.10 to 2.3.21

Bumps `kotlin` from 2.3.10 to 2.3.21.

Updates `org.jetbrains.kotlin:kotlin-test` from 2.3.10 to 2.3.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.10...v2.3.21)

Updates `org.jetbrains.kotlin.jvm` from 2.3.10 to 2.3.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.3.10...v2.3.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-test
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.3.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 bouncy-castle = "1.83"
 shadow = "9.3.1"
-kotlin = "2.3.10"
+kotlin = "2.3.21"
 kotlinx = "1.10.2"
 picocli = "4.7.7"
 revanced-patcher = "22.0.1"