chore(deps): Upgrade Gson 2.8.5 -> 2.8.6

[hisener]

See google/gson@gson-parent-2.8.5...gson-parent-2.8.6

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This causes dependency convergence in downstream code since 2.8.5 is a very old version.

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[hisener]

@googlebot I signed it!

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🎉 This PR is included in version 0.15.4 🎉

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