chore(deps): bump kotlin.version from 2.0.20 to 2.1.0 in /kotlin-rout…

…es (#1596)

Bumps `kotlin.version` from 2.0.20 to 2.1.0.

Updates `org.jetbrains.kotlin:kotlin-maven-allopen` from 2.0.20 to 2.1.0

Updates `org.jetbrains.kotlin:kotlin-maven-plugin` from 2.0.20 to 2.1.0

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

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