add pre-commit update workflow as dependabot does not support it yet (#387)

Author: hendrikmuhs

.github/workflows/pre-commit-update.yml

@@ -0,0 +1,21 @@
+name: Pre-commit auto-update
+
+on:
+  # every monday at midnight
+  schedule:
+    - cron: "0 0 * * 1"
+  # on demand
+  workflow_dispatch:
+
+jobs:
+  upgrade:
+    uses: browniebroke/github-actions/.github/workflows/pre-commit-autoupdate.yml@v1.21.0
+    secrets:
+      gh_pat: ${{ secrets.GH_PERSONAL_ACCESS_TOKEN }}
+    with:
+      # Inputs listed with their default (all optional)
+      config_path: ".pre-commit-config.yaml" # path is relative to repository root
+      python_version: "3.11"
+      branch_name: "update/pre-commit-hooks"
+      pull_request_title: "chore: upgrade pre-commit dependencies"
+      commit_message: "chore: upgrade pre-commit dependencies"