deps: update googletest reference

[illwieckz]

Running ./fetch-externals (required for make check) will now clone a newer version of googletest that is now required. Breakpad requires C++20 and I have faced some old references of googletest not supporting it.

I haven't checked if that exact old reference was broken, but I've checked that the new reference is working.

We may use https://github.com/DaemonEngine/googletest if preferred.

Picked from:

• Implement the CI in GitHub Actions #37

[slipher]

How can 6910c9d9165801d8827d628cb72eb7ea9dd538c5 be too old when that's the one upstream uses?

[slipher]

Oh now I see

I haven't checked if that exact old reference was broken

But it turns out not to be old: it is still in sync with upstream's .gitmodules (they switched to submodules less than a year ago).

[illwieckz]

Right, after some research, the commit reference was 5ec7f0c4a113e2f18ac2c6cc7df51ad6afc24081 after the main merge in our tree. Maybe a merge mismatch. That 5ec7f0 is not suitable for sure.

[illwieckz]

Since https://github.com/DaemonEngine/googletest is also on 6910c9d, we mays also use that as upstream.

[illwieckz]

Since https://github.com/DaemonEngine/googletest is also on 6910c9d, we mays also use that as upstream.

I meant the url (my phrase was ambiguous).

[illwieckz]

Let's close this, we don't need a pull request to discuss if we wants the googletest upstream to be https://github.com/DaemonEngine/googletest.git instead of https://github.com/google/googletest.git.