Update to Spring Framework 6.0.0-M6

Closes gh-907

buildSrc/build.gradle

@@ -23,5 +23,5 @@ dependencies {
 	implementation "org.hidetake:gradle-ssh-plugin:2.10.1"
 	implementation "org.jfrog.buildinfo:build-info-extractor-gradle:4.26.1"
 	implementation "org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:2.7.1"
-	implementation "org.springframework:spring-core:6.0.0-M5"
+	implementation "org.springframework:spring-core:6.0.0-M6"
 }

gradle.properties

@@ -2,7 +2,7 @@ version=1.0.0-SNAPSHOT
 org.gradle.jvmargs=-Xmx3g -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true
 org.gradle.caching=true
-springFrameworkVersion=6.0.0-M5
+springFrameworkVersion=6.0.0-M6
 springSecurityVersion=6.0.0-M6
 springJavaformatVersion=0.0.31
 springJavaformatExcludePackages=org/springframework/security/config org/springframework/security/oauth2