Increase ARM integration test timeout (#5222)

The ARM integration tests take a very long time to run for some reason.  For example, in the stable-2.9.0 release, they took 
38 minutes.  Thus, this test needs a longer timeout.

Increase the ARM integration test timeout from 30 minutes to 60 minutes.

Signed-off-by: Alex Leong <alex@buoyant.io>

.github/workflows/release.yml

@@ -136,7 +136,7 @@ jobs:
         bin/tests --images skip --name ${{ matrix.integration_test }} "$CMD"
   arm64_integration_tests:
     name: ARM64 integration tests
-    timeout-minutes: 30
+    timeout-minutes: 60
     runs-on: ubuntu-18.04
     needs: [docker_build]
     steps: