Update spring boot to v3.1.5

Author: renovate[bot]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ kotest-spring = "1.1.3"
 graphql-java = "20.7"
 graphql-kickstart-spring-boot = "15.0.0"
 commons-text = "1.10.0"
-spring-boot = "3.1.0"
+spring-boot = "3.1.5"
 dgs = "7.6.0"
 
 [libraries]