chore: move submodule update to dependabot and remove unused workflow (#1478)

.github/dependabot.yml

@@ -15,3 +15,10 @@ updates:
   open-pull-requests-limit: 10
   labels:
     - "merge when passing"
+- package-ecosystem: gitsubmodule
+  directory: /
+  schedule:
+    interval: daily
+  open-pull-requests-limit: 10
+  labels:
+    - "merge when passing"

.github/workflows/submodule-sync.yml

@@ -1,29 +0,0 @@
-on:
-  workflow_dispatch:
-
-jobs:
-  sync:
-    name: Submodule Sync
-    runs-on: ubuntu-latest
-
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-        with:
-          fetch-depth: 0
-          submodules: recursive
-
-      - name: Git Sumbodule Update
-        run: |
-          git pull --recurse-submodules
-          git submodule update --remote --recursive
-      
-      - name: Create Pull Request
-        uses: peter-evans/create-pull-request@v5.0.2
-        with:
-          title: "Updated submodule"
-          labels: "merge when passing"
-          branch: "chore/update-submodule"
-          commit-message: "Updated submodule"
-          body: "Updated submodule"
-          token: ${{ secrets.PAT_TOKEN }}