Update spring boot to v3.4.3

Author: renovate[bot]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ kotest-spring = "1.3.0"
 graphql-java = "22.3"
 graphql-kickstart-spring-boot = "15.1.0"
 commons-text = "1.13.0"
-spring-boot = "3.4.2"
+spring-boot = "3.4.3"
 dgs = "10.0.3"
 
 [libraries]