Upgrade to Spring Framework 6.2.15

Closes gh-47

Author: rainboyan

gradle/libs.versions.toml

@@ -31,7 +31,7 @@ objenesis = "3.4"
 slf4j = "2.0.17"
 snakeyaml = "2.3"
 spock = "2.3-groovy-4.0"
-spring-framework = "6.2.11"
+spring-framework = "6.2.15"
 
 [libraries]
 caffeine = { module = "com.github.ben-manes.caffeine:caffeine", version.ref = "caffeine" }