Use Spring Framework 6.0.0-M3

This reverts a portion of commit 000b87f9aae82d96bc987ddf19b8b7e37b55f625

gradle.properties

@@ -1,7 +1,7 @@
 aspectjVersion=1.9.9.1
 springJavaformatVersion=0.0.31
 springBootVersion=2.4.2
-springFrameworkVersion=6.0.0-SNAPSHOT
+springFrameworkVersion=6.0.0-M3
 openSamlVersion=3.4.6
 version=6.0.0-SNAPSHOT
 kotlinVersion=1.6.21