Update gradle version

[MaxRev-Dev]

I had a repro of #384 with

• Unity 2019.2.x
• External Dependency Manager 1.2.157
  Updating gradle fixes the problem.

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[MaxRev-Dev]

@googlebot I signed it!

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[chkuang-g]

Hi @MaxRev-Dev

Sorry I cannot accept this CL. I tried this myself awhile ago and it broke EDM4U unit test. Try this:

./gradlew testDownloadArtifacts

I commented my concerns here.
#384 (comment)

Let me know if you can pass the test and make sure all SDK that is using EDM4U will not break because of the change.