fix(deps): update dependency com.google.code.gson:gson to v2.9.1

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.code.gson:gson	2.9.0 -> 2.9.1

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Release Notes

google/gson

### [`v2.9.1`](https://togithub.com/google/gson/blob/HEAD/CHANGELOG.md#Version-291) - Make `Object` and `JsonElement` deserialization iterative rather than recursive ([#​1912](https://togithub.com/google/gson/issues/1912)) - Added parsing support for enum that has overridden toString() method ([#​1950](https://togithub.com/google/gson/issues/1950)) - Removed support for building Gson with Gradle ([#​2081](https://togithub.com/google/gson/issues/2081)) - Removed obsolete `codegen` hierarchy ([#​2099](https://togithub.com/google/gson/issues/2099)) - Add support for reflection access filter ([#​1905](https://togithub.com/google/gson/issues/1905)) - Improve `TypeToken` creation validation ([#​2072](https://togithub.com/google/gson/issues/2072)) - Add explicit support for `float` in `JsonWriter` ([#​2130](https://togithub.com/google/gson/issues/2130), [#​2132](https://togithub.com/google/gson/issues/2132)) - Fail when parsing invalid local date ([#​2134](https://togithub.com/google/gson/issues/2134)) Also many small improvements to javadoc.

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Unit Test Results

366 tests  ±0   366 :heavy_check_mark: ±0   28s :stopwatch: -2s 154 suites ±0       0 :zzz: ±0  154 files   ±0       0 :x: ±0 

Results for commit 771a4446. ± Comparison against base commit 2b438150.