Unpin git-commit

Doom bumped both packages this time, so they are back in sync.

fetch-overrides.nix

@@ -42,12 +42,6 @@
     sly-stepper = "da84e3bba8466c2290c2dc7c27d7f4c48c27b39e";
     # In emacsattic, so shouldn't change underneath us.
     ammonite-term-repl = "b552fe21977e005c1c460bf6607557e67241a6b6";
-
-    # Temporarily override git-commit, which Doom pins to an earlier commit than magit
-    # (built from the same repo). When building with straight, the magit pin seems to "win",
-    # making this a non-issue for Doom (since there have been no significant changes to git-commit).
-    # CI should fail again the next time Doom updates magit, so this won't go stale.
-    git-commit = "b9948f9571928bb7f39f4b3a112bd76e52a072ce";
   };
 
   # Domains for which to force `shallow = false`.