fix(backend): Explicitly set refspec on fetch

[brendan-kellam]

For certain repos, re-indexing would fail when calling git fetch with error message fatal: couldn't find remote ref HEAD. The theory is that while we did have a refspec for remote.origin.fetch, it was not being resolved since we were fetching against the remote url and not origin. The solution is to specify the refspec inline with the fetch command.

Fixes #492

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[brendan-kellam]

@musabshak do you mind pasting the error message you were seeing during fetch so I can include it in the PR description? Nvm it's in the issue 😅