Update to Kotlin 1.8.10

Closes gh-12788

gradle.properties

@@ -6,7 +6,7 @@ springFrameworkVersion=6.0.0
 micrometerVersion=1.10.1
 openSamlVersion=4.1.1
 version=6.1.0-SNAPSHOT
-kotlinVersion=1.7.21
+kotlinVersion=1.8.10
 samplesBranch=main
 org.gradle.jvmargs=-Xmx3g -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true