Bump KOTLIN_VERSION from 2.1.10 to 2.1.21 (#949)

Bumps `KOTLIN_VERSION` from 2.1.10 to 2.1.21.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.1.10 to 2.1.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.10...v2.1.21)

Updates `org.jetbrains.kotlin:kotlin-stdlib` from 2.1.10 to 2.1.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.10...v2.1.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
     ext {
-        KOTLIN_VERSION = "2.1.10"
+        KOTLIN_VERSION = "2.1.21"
         KETHEREUM_VERSION = "0.86.0"
     }