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/rc19bqkq3nvjkvrpz1ghhkc5fp0lli9k-packages.json.drv
building '/nix/store/rc19bqkq3nvjkvrpz1ghhkc5fp0lli9k-packages.json.drv'...

Going to be running update for following packages:
 - borgmatic-2.1.5

Press Enter key to continue...
Running update for:
Enqueuing group of 1 packages
 - borgmatic-2.1.5: UPDATING ...
 - borgmatic-2.1.5: 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 682d8808520e..39df76143501 100644
--- a/pkgs/by-name/bo/borgmatic/package.nix
+++ b/pkgs/by-name/bo/borgmatic/package.nix
@@ -15,7 +15,7 @@
 }:
 python3Packages.buildPythonApplication (finalAttrs: {
   pname = "borgmatic";
-  version = "2.1.5";
+  version = "2.1.6";
   pyproject = true;
 
   strictDeps = true;
@@ -23,7 +23,7 @@ python3Packages.buildPythonApplication (finalAttrs: {
 
   src = fetchPypi {
     inherit (finalAttrs) pname version;
-    hash = "sha256-T0+E6opyfr7zxfP44OlNuhqsdQyi7OdIXiE5r310LaU=";
+    hash = "sha256-Mgx8PnGfTa5j6+53RVntPHa5EDJAY2NQC3fvmyRj24Y=";
   };
 
   passthru.updateScript = nix-update-script { };

No auto update branch exists
There might already be an open PR for this update:
- borgmatic: 2.1.5 -> 2.1.6, add changelog
  URL "https://api.github.com/repos/NixOS/nixpkgs/issues/538348"