Bump junitJupiterVersion

- Update JUnit Jupiter from `5.13.4` to `6.0.0-RC2` in build.gradle
- Add `@SuppressWarnings("NullAway")` annotations to `LogLevelsCondition` `beforeEach()` and `afterEach()` methods due to dataflow analysis limitations
- Verified that JUnit version did not require an update

Author: cppwfs

build.gradle

@@ -78,7 +78,7 @@ ext {
     jrubyVersion = '10.0.2.0'
     jsonpathVersion = '2.9.0'
     junit4Version = '4.13.2'
-    junitJupiterVersion = '5.13.4'
+    junitJupiterVersion = '6.0.0-RC2'
     kotlinCoroutinesVersion = '1.10.2'
     kryoVersion = '5.6.2'
     lettuceVersion = '6.8.1.RELEASE'

spring-integration-test-support/src/main/java/org/springframework/integration/test/condition/LogLevelsCondition.java

@@ -67,6 +67,7 @@ public ConditionEvaluationResult evaluateExecutionCondition(ExtensionContext con
 	}
 
 	@Override
+	@SuppressWarnings("NullAway") // Dataflow analysis limitation
 	public void beforeEach(ExtensionContext context) {
 		Store store = context.getStore(Namespace.create(getClass(), context));
 		LogLevels logLevels = store.get(STORE_ANNOTATION_KEY, LogLevels.class);
@@ -82,6 +83,7 @@ public void beforeEach(ExtensionContext context) {
 	}
 
 	@Override
+	@SuppressWarnings("NullAway") // Dataflow analysis limitation
 	public void afterEach(ExtensionContext context) {
 		Store store = context.getStore(Namespace.create(getClass(), context));
 		LevelsContainer container = store.get(STORE_CONTAINER_KEY, LevelsContainer.class);