added dependabot and update action

Author: mlodic

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "monthly"
+      day: "tuesday"
+    target-branch: "main"
+    ignore:
+      # ignore all patch updates since we are using ~=
+      # this does not work for security updates
+      - dependency-name: "*"
+        update-types: ["version-update:semver-patch"]

.github/workflows/deploy_and_update_submodules.yml

@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: recursive # Recursively checkout submodules