Bump org.jetbrains.kotlin:kotlin-bom from 2.2.20 to 2.2.21

Author: rwinch

gradle/libs.versions.toml

@@ -8,7 +8,7 @@ org-apache-maven-resolver = "1.9.24"
 org-aspectj = "1.9.24"
 org-bouncycastle = "1.80"
 org-eclipse-jetty = "11.0.26"
-org-jetbrains-kotlin = "2.2.20"
+org-jetbrains-kotlin = "2.2.21"
 org-jetbrains-kotlinx = "1.10.2"
 org-mockito = "5.17.0"
 org-opensaml5 = "5.1.6"