ci: set branch and commit-msg inputs for action call

Author: CompeyDev

.github/workflows/nix-flake-update.yml

@@ -38,6 +38,8 @@ jobs:
         with:
           git-committer-name: "github-actions[bot]"
           git-committer-email: "41898282+github-actions[bot]@users.noreply.github.com"
+          branch: build/nix-flake-lock-update
+          pr-title: "build(nix): update input dep versions" 
           pr-title: "build(nix): update input dep versions" 
           pr-labels: |
             automated