Start building against Spring Framework 6.1.4 snapshots

See gh-39494

Author: wilkinsona

gradle.properties

@@ -12,7 +12,7 @@ junitJupiterVersion=5.10.1
 kotlinVersion=1.9.22
 mavenVersion=3.9.4
 nativeBuildToolsVersion=0.10.0
-springFrameworkVersion=6.1.3
+springFrameworkVersion=6.1.4-SNAPSHOT
 tomcatVersion=10.1.18
 
 kotlin.stdlib.default.dependency=false