Close in-memory file system when provider is closed

Author: marcphilipp

jupiter-tests/src/test/java/org/junit/jupiter/engine/extension/CloseablePathTests.java

@@ -236,7 +236,7 @@ public Path createTempDirectory(AnnotatedElementContext elementContext, Extensio
 
 			@Override
 			public void close() throws IOException {
-				TempDirFactory.super.close();
+				fileSystem.close();
 			}
 		}