feat: Replace buildbot-nix with auxolotl fork

I have forked buildbot-nix to https://git.auxolotl.org/auxolotl/buildbot-nix

I have made an improvement there to how output paths are written, and
this input change pulls in the update

flake.lock

@@ -72,17 +72,17 @@
         "treefmt-nix": "treefmt-nix"
       },
       "locked": {
-        "lastModified": 1722025605,
-        "narHash": "sha256-WKgvUD1V5w3GQ/uycqHMmYXhYvbB0T0EnKFeQ8hb6j8=",
-        "owner": "nix-community",
-        "repo": "buildbot-nix",
-        "rev": "225d286fa78389329168befc5d26888e317d0d0d",
-        "type": "github"
+        "lastModified": 1722156618,
+        "narHash": "sha256-SU6dv1VGafsTueKsecwdIyJhhvONrDHgDWBXENPL6vc=",
+        "ref": "refs/heads/main",
+        "rev": "70dfe2521154a0e1b25ec93b82f63e559eb53fc4",
+        "revCount": 369,
+        "type": "git",
+        "url": "https://git.auxolotl.org/auxolotl/buildbot-nix.git"
       },
       "original": {
-        "owner": "nix-community",
-        "repo": "buildbot-nix",
-        "type": "github"
+        "type": "git",
+        "url": "https://git.auxolotl.org/auxolotl/buildbot-nix.git"
       }
     },
     "darwin": {

flake.nix

@@ -25,7 +25,7 @@
       inputs.nixpkgs.follows = "nixpkgs";
     };
 
-    buildbot-nix.url = "github:nix-community/buildbot-nix";
+    buildbot-nix.url = "git+https://git.auxolotl.org/auxolotl/buildbot-nix.git";
     # Do not override nixpkgs in buildbot-nix (see https://github.com/nix-community/buildbot-nix)
 
     deploy-rs = {