[main] (deps): Bump src/submodules/googletest (dotnet#63916)

Bumps [src/submodules/googletest](https://github.com/google/googletest) from `50b8600` to `9706f75`. - [Release notes](https://github.com/google/googletest/releases) - [Commits](google/googletest@50b8600...9706f75) --- updated-dependencies: - dependency-name: src/submodules/googletest dependency-version: 9706f75b8f91c52a3840cf5d878a7f37ea10ef00 dependency-type: direct:production ... Signed-off-by: dependabot[bot] <support@github.com> Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]