Update to upstream jgit version

Followup changes necessary after
https://gerrit-review.googlesource.com/#/c/73632/

Change-Id: I5f35c15c0904a93a2a59390ff6d5b049e9f3177a
diff --git a/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java b/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java
index b07bf91..0550e6e 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/gitiles/FilteredRepository.java
@@ -29,6 +29,7 @@
 import com.google.inject.Inject;
 import com.google.inject.Provider;
 
+import org.eclipse.jgit.attributes.AttributesNodeProvider;
 import org.eclipse.jgit.lib.ReflogReader;
 import org.eclipse.jgit.lib.ObjectDatabase;
 import org.eclipse.jgit.lib.Ref;
@@ -108,6 +109,11 @@
   }
 
   @Override
+  public AttributesNodeProvider createAttributesNodeProvider() {
+    return delegate.createAttributesNodeProvider();
+  }
+
+  @Override
   public ObjectDatabase getObjectDatabase() {
     // No access control on object database; Gitiles ensures objects are only
     // accessed if they are visible by the user according to ACLs on the refs.