Updates junit versions to 5.12.1

docker/spring-cloud-contract-docker/project/build.gradle

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

docker/spring-cloud-contract-docker/project/buildSrc/build.gradle

@@ -7,7 +7,7 @@ repositories {
 
 ext {
 	roasterVersion = "2.22.3.Final"
-	junit5Version = "5.6.2"
+	junit5Version = "5.12.1"
 }
 
 dependencies {
@@ -16,5 +16,5 @@ dependencies {
 }
 
 test {
-	useJUnitPlatform()
+	useJUnitPlatform("5.12.1")
 }

spring-cloud-contract-tools/spring-cloud-contract-gradle-plugin/build.gradle

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