Upgrade to Spring Framework 7.0.0-M8

Closes gh-46620

Author: snicoll

gradle.properties

@@ -19,7 +19,7 @@ mavenVersion=3.9.10
 mockitoVersion=5.18.0
 nativeBuildToolsVersion=0.11.0
 snakeYamlVersion=2.4
-springFrameworkVersion=7.0.0-SNAPSHOT
+springFrameworkVersion=7.0.0-M8
 springFramework60xVersion=6.0.23
 tomcatVersion=11.0.10
 nullabilityPluginVersion=0.0.2