Updates junit versions to 5.12.1

Author: spencergibb

Diff for: docker/spring-cloud-contract-docker/project/build.gradle

@@ -114,7 +114,9 @@ dependencies {
 }
 
 contractTest {
-	useJUnitPlatform("5.12.1")
+	useJUnitPlatform {
+		version = "5.12.1"
+	}
 	if (getProp(envVars, "MESSAGING_TYPE") != "") {
 		systemProperty("spring.profiles.active", "messagingtype")
 	} else if (getProp(envVars, "STANDALONE_PROTOCOL") != "") {

Diff for: docker/spring-cloud-contract-docker/project/buildSrc/build.gradle

@@ -16,5 +16,7 @@ dependencies {
 }
 
 test {
-	useJUnitPlatform("5.12.1")
+	useJUnitPlatform {
+		version = "5.12.1"
+	}
 }

Diff for: spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/build.gradle

@@ -101,7 +101,9 @@ task libtest() {
 }
 
 test {
-	useJUnitPlatform("5.12.1")
+	useJUnitPlatform {
+		version = "5.12.1"
+	}
 	testLogging {
 		exceptionFormat = 'full'
 	}