chore(deps): update deps/googletest digest to add971c (#1696)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [deps/googletest](https://github.com/google/googletest) ([changelog](https://github.com/google/googletest/compare/dc3c9eda2f02ba32de9329dd27ace7e527f492dc..add971c7cb497d40985b48641891bf9b51423730)) | digest | `dc3c9ed` → `add971c` |

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Reviewed-on: https://codeberg.org/umati/Sample-Server/pulls/1696

Author: umati-bot