Running nixpkgs-update (https://nix-community.org/update-bot/) with UPDATE_INFO: borgmatic 0 -> 1
attrpath: borgmatic
Checking auto update branch...
[version] 
[version] skipping because derivation has updateScript
[rustCrateVersion] 
[rustCrateVersion] No cargoHash found
[golangModuleVersion] 
[golangModuleVersion] Not a buildGoModule package with vendorHash
[npmDepsVersion] 
[npmDepsVersion] No npmDepsHash
[updateScript] 
[updateScript] Success
[updateScript] this derivation will be built:
  /nix/store/3ldg6w3jw6s94mj0z6pn5aid77l4afnf-packages.json.drv
building '/nix/store/3ldg6w3jw6s94mj0z6pn5aid77l4afnf-packages.json.drv'...

Going to be running update for following packages:
 - borgmatic-2.0.13

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - borgmatic-2.0.13: UPDATING ...
 - borgmatic-2.0.13: DONE.

Packages updated!

Diff after rewrites:
diff --git a/pkgs/by-name/bo/borgmatic/package.nix b/pkgs/by-name/bo/borgmatic/package.nix
index e4a1eadabdbb..421c24120126 100644
--- a/pkgs/by-name/bo/borgmatic/package.nix
+++ b/pkgs/by-name/bo/borgmatic/package.nix
@@ -15,12 +15,12 @@
 }:
 python3Packages.buildPythonApplication rec {
   pname = "borgmatic";
-  version = "2.0.13";
+  version = "2.1.0";
   pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-0Prjgh/L5nCo3CNXZccNW9Dz3d6jIfrXDZmy5fL6zrU=";
+    hash = "sha256-SV8h+/o0EwcGhi1EcQkhz/9uCgeERGQBKZVUgEaGXmQ=";
   };
 
   passthru.updateScript = nix-update-script { };

No auto update branch exists
There might already be an open PR for this update:
- borgmatic: 2.0.13 -> 2.1.0
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/480880"