Start building against Spring Framework 6.1.19 snapshots

See spring-projectsgh-45057

Author: philwebb

gradle.properties

@@ -19,7 +19,7 @@ mavenVersion=3.9.4
 mockitoVersion=5.11.0
 nativeBuildToolsVersion=0.10.6
 snakeYamlVersion=2.2
-springFrameworkVersion=6.1.18
+springFrameworkVersion=6.1.19-SNAPSHOT
 springFramework60xVersion=6.0.23
 tomcatVersion=10.1.40