Prepare for 2.15.1 Release (#8611)

Author: UnderscoreTud

gradle.properties

@@ -5,7 +5,7 @@ org.gradle.parallel=true
 
 groupid=ch.njol
 name=skript
-version=2.15.0
+version=2.15.1
 jarName=Skript.jar
 testEnv=java25/paper-26.1.1
 testEnvJavaVersion=25