[BE] chore: gson 의존성 제거

[dongho108]

Issues

• [x] #439

논의사항

일단 gson 의존성을 제거해봤어요

close #439

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Unit Test Results

  31 files    31 suites   8s :stopwatch: 162 tests 161 :heavy_check_mark: 1 :zzz: 0 :x: 166 runs  165 :heavy_check_mark: 1 :zzz: 0 :x:

Results for commit d96d65fe.

:recycle: This comment has been updated with latest results.

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