Add renovate

Change-Id: Iaab5682c3cb618ce2bc7a2e6cbe8be45b784f4c1
diff --git a/flake.nix b/flake.nix
index f0e044f..293236b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -25,6 +25,7 @@
               patchutils
               python311Packages.tox
               reno
+              renovate
             ];
           };
         }