Fix git-sync crash when whitespace in path

[RedEtherbloom]

Description

We fixed the home-manager git-sync to properly escape the arguments that get written into the users git-sync-\<name>.service.

We additionally bumped the nixpkgs-unstable version to include our recently merged update PR for git-sync. git-sync was 2 years out of date and also had a bug with repo paths containing whitespaces.

Checklist

• [x] Change is backwards compatible.

• [x] Code formatted with ./format.

• [x] Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.(Excluding the four broken, non-related tests, in #6049)

• [x] Test cases updated/added. See example.

• [x] Commit messages are formatted like

  {component}: {description}
  
  {long description}

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • [ ] Added myself as module maintainer. See example.

Maintainer CC

@colonelpanic8 @cab404 @ryane

[RedEtherbloom]

PR is technically ready to be merged, the only 'blocker' is the CI tests failing due to #6049

[RedEtherbloom]

I sadly found another git-sync bug (soft) blocking this: https://github.com/simonthum/git-sync/issues/33

[rycee]

Thanks! Merged to master now 🙂