Upgrade to Spring Framework 6.0 M4

Closes #1693

Author: christophstrobl

parent/pom.xml

@@ -131,7 +131,7 @@
 		<rxjava3>3.1.4</rxjava3>
 		<smallrye-mutiny>1.4.0</smallrye-mutiny>
 		<slf4j>1.7.32</slf4j>
-		<spring>6.0.0-SNAPSHOT</spring>
+		<spring>6.0.0-M4</spring>
 		<spring-hateoas>2.0.0-SNAPSHOT</spring-hateoas>
 		<spring-plugin>3.0.0-M1</spring-plugin>
 		<servlet-api>5.0.0</servlet-api>