[test] Bump total timeout for slow builder

TBR=sergiyb@chromium.org
NOTRY=true

Bug: v8:7783
Change-Id: I96a42759b8e1eecb74fdce5d8c43a6d93b6af0d6
Reviewed-on: https://chromium-review.googlesource.com/c/1370038Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58134}

infra/testing/builders.pyl

@@ -1269,6 +1269,10 @@
     ],
   },
   'V8 Linux - arm64 - sim - debug': {
+    # TODO(machenbach): Remove longer timeout when this builder scales better.
+    'swarming_task_attrs': {
+      'hard_timeout': 3600,
+    },
     'tests': [
       {'name': 'mjsunit_sp_frame_access'},
       {'name': 'mozilla', 'shards': 2},