Start building against Spring Framework 6.1.13 snapshots

See gh-42133

Author: wilkinsona

gradle.properties

@@ -14,7 +14,7 @@ junitJupiterVersion=5.10.3
 kotlinVersion=1.9.25
 mavenVersion=3.9.4
 nativeBuildToolsVersion=0.10.2
-springFrameworkVersion=6.1.12
+springFrameworkVersion=6.1.13-SNAPSHOT
 springFramework60xVersion=6.0.23
 tomcatVersion=10.1.28
 snakeYamlVersion=2.2