Update Spock for Groovy 4.0 compatibility

Closes gh-30318

spring-boot-project/spring-boot-docs/src/docs/asciidoc/features/testing.adoc

@@ -797,10 +797,10 @@ Alternatively, you can specify a source for your test, which disables the behavi
 
 [[features.testing.spring-boot-applications.spock]]
 ==== Using Spock to Test Spring Boot Applications
-Spock 2.x can be used to test a Spring Boot application.
-To do so, add a dependency on Spock's `spock-spring` module to your application's build.
+Spock 2.2 or later can be used to test a Spring Boot application.
+To do so, add a dependency on a `-groovy-4.0` version of Spock's `spock-spring` module to your application's build.
 `spock-spring` integrates Spring's test framework into Spock.
-See https://spockframework.org/spock/docs/2.0/modules.html#_spring_module[the documentation for Spock's Spring module] for further details.
+See https://spockframework.org/spock/docs/2.2-M1/modules.html#_spring_module[the documentation for Spock's Spring module] for further details.
 
 
 

spring-boot-project/spring-boot-parent/build.gradle

@@ -154,11 +154,10 @@ bom {
 			]
 		}
 	}
-	library("Spock Framework", "2.0-groovy-3.0") {
+	library("Spock Framework", "2.2-M1-groovy-4.0") {
 		group("org.spockframework") {
-			modules = [
-				"spock-core",
-				"spock-spring"
+			imports = [
+				"spock-bom"
 			]
 		}
 	}