chore(3p/sources/nix-gerrit): bump nix-gerrit

The current bazel fetcher doesn't work if run on a machine without any
IPv4 addresses (v4 connectivity provided by 6to4 and NAT64).

Change-Id: I2418ef35efcf6629cbd3a4b0d988c1a3c4add8f0
Reviewed-on: https://cl.snix.dev/c/snix/+/30673
Tested-by: besadii
Reviewed-by: Florian Klink <flokli@flokli.de>
Reviewed-by: Ryan Lahfa <ryan@lahfa.xyz>

third_party/sources/sources.json

@@ -87,7 +87,7 @@
     "nix-gerrit": {
         "branch": "main",
         "repo": "https://git.lix.systems/the-distro/nix-gerrit.git",
-        "rev": "b730594c169cf14dd9c258902d58e8bb7709501f",
+        "rev": "1fdef9c8c8c876f410b75b0c4220ad8221572ef8",
         "type": "git"
     },
     "nixpkgs": {