Update to Spring Framework 7.0.0-M7

Closes gh-17559

gradle/libs.versions.toml

@@ -13,7 +13,7 @@ org-jetbrains-kotlinx = "1.10.2"
 org-mockito = "5.17.0"
 org-opensaml = "4.3.2"
 org-opensaml5 = "5.1.2"
-org-springframework = "7.0.0-SNAPSHOT"
+org-springframework = "7.0.0-M7"
 
 [libraries]
 ch-qos-logback-logback-classic = "ch.qos.logback:logback-classic:1.5.18"