Fix for java 11

Author: ngocnhan-tran1996

Diff for: micrometer-osgi-test/build.gradle

@@ -26,7 +26,9 @@ dependencies {
 def testingBundle = tasks.register('testingBundle', Bundle) {
     archiveClassifier = 'tests'
     from sourceSets.test.output
-
+    if (JavaLanguageVersion.current().asInt() < 17) {
+        sourceSet = sourceSets.test
+    }
     bundle {
         bnd """\
             Bundle-SymbolicName: \${task.archiveBaseName}-\${task.archiveClassifier}