[Release 1.2.0] Update version

Author: github-actions[bot]

gradle.properties

@@ -1,4 +1,4 @@
-version=1.2.0-SNAPSHOT
+version=1.2.0
 version.samples=1.2.0-SNAPSHOT
 
 org.gradle.caching=true

gradle/libs.versions.toml

@@ -23,7 +23,7 @@ hamcrest = "2.2"
 mockito = "5.12.0"
 spring-dep-mgmt = "1.1.6"
 spring-boot = "3.4.0-SNAPSHOT"
-spring-boot-for-docs = "3.4.0-SNAPSHOT"
+spring-boot-for-docs = "3.4.0"
 spring-cloud-stream = "4.2.0-SNAPSHOT"
 spring-retry = "2.0.10"
 system-lambda = "1.2.1"