build(deps): bump kotlinVersion from 2.1.10 to 2.1.20

Bumps `kotlinVersion` from 2.1.10 to 2.1.20.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.1.10 to 2.1.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.10...v2.1.20)

Updates `org.jetbrains.kotlin:kotlin-allopen` from 2.1.10 to 2.1.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.10...v2.1.20)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle

@@ -13,7 +13,7 @@ buildscript {
         guavaVersion = '33.4.5-jre'
         h2Version = '1.4.200'
         jsonPathVersion = '2.9.0'
-        kotlinVersion = '2.1.10'
+        kotlinVersion = '2.1.20'
         ktlintVersion = '1.5.0'
         passayVersion = '1.6.6'
         postgresqlJdbcVersion = '42.7.5'