Use try with resources to close repository after use

Author: MarkEWaite

src/main/java/jenkins/plugins/git/AbstractGitSCMSource.java

@@ -951,8 +951,8 @@ protected SCMRevision retrieve(@NonNull final String revision, @NonNull final Ta
                                   @Override
                                   public SCMRevision run(GitClient client, String remoteName) throws IOException,
                                           InterruptedException {
-                                      final Repository repository = client.getRepository();
-                                      try (RevWalk walk = new RevWalk(repository)) {
+                                      try (final Repository repository = client.getRepository();
+                                           RevWalk walk = new RevWalk(repository)) {
                                           ObjectId ref = client.revParse(tagRef);
                                           RevCommit commit = walk.parseCommit(ref);
                                           long lastModified = TimeUnit.SECONDS.toMillis(commit.getCommitTime());