chore: bump jvm from 2.1.10 to 2.1.20 in /graphql-kotlin (#3198)

Bumps [jvm](https://github.com/JetBrains/kotlin) 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: jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

graphql-kotlin/build.gradle.kts

@@ -6,7 +6,7 @@ import org.jetbrains.kotlin.gradle.dsl.KotlinVersion
 plugins {
     id("org.springframework.boot") version "3.4.4"
     id("io.spring.dependency-management") version "1.1.7"
-    kotlin("jvm") version "2.1.10"
+    kotlin("jvm") version "2.1.20"
     kotlin("plugin.spring") version "2.1.20"
 }