Bump tests/gtest from 5a37b51 to d83fee1 (#263)

Bumps [tests/gtest](https://github.com/google/googletest) from `5a37b51` to `d83fee1`.
- [Release notes](https://github.com/google/googletest/releases)
- [Commits](google/googletest@5a37b51...d83fee1)

---
updated-dependencies:
- dependency-name: tests/gtest
  dependency-type: direct:production
...

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