Automerge Nix lock file maintenance

.github/renovate.json

@@ -88,6 +88,7 @@
         ".github/workflows/matrix.yml",
         ".github/workflows/renovate.yml",
         ".github/workflows/update-translations.yml",
+        "flake.nix",
         "flake.lock",
         "i18n/requirements.txt",
         "mise.toml"