build(deps): bump org.jetbrains.kotlin:kotlin-stdlib

Bumps [org.jetbrains.kotlin:kotlin-stdlib](https://github.com/JetBrains/kotlin) from 2.3.20 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@v2.3.20...v2.3.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  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]

serverpackcreator-api/build.gradle.kts

@@ -15,8 +15,8 @@ dependencies {
     api("io.github.microutils:kotlin-logging:3.0.5")
     api("org.jetbrains.kotlinx:kotlinx-datetime:0.7.1-0.6.x-compat")
     api("de.jensklingenberg.ktorfit:ktorfit-lib:2.7.2")
-    implementation("org.jetbrains.kotlin:kotlin-bom:2.3.20")
-    implementation("org.jetbrains.kotlin:kotlin-stdlib:2.3.20")
+    implementation("org.jetbrains.kotlin:kotlin-bom:2.3.21")
+    implementation("org.jetbrains.kotlin:kotlin-stdlib:2.3.21")
     api("de.comahe.i18n4k:i18n4k-core:0.11.1")
     api("de.comahe.i18n4k:i18n4k-core-jvm:0.11.1")
     implementation(files("${layout.buildDirectory.asFile.get()}/resources/main"))