Android LlamaDemo update gradle version

[kirklandsign]

Summary

Android Studio suggests

Test plan

CI

cc @cbilgin

[pytorch-bot]

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❌ 1 New Failure

As of commit c12f97b with merge base 010e68a ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 5

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