[CI] allow automatic merging of github action updates (#11868)

## Description 

Otherwise it takes effort to approve individual github workflow action
updates.
Also, make dependabot run more frequently to catch up on backlogs.

## Test Plan 

CI

---
If your changes are not user-facing and not a breaking change, you can
skip the following section. Otherwise, please indicate what changed, and
then add to the Release Notes section as highlighted during the release
process.

### Type of Change (Check all that apply)

- [ ] user-visible impact
- [ ] breaking change for a client SDKs
- [ ] breaking change for FNs (FN binary must upgrade)
- [ ] breaking change for validators or node operators (must upgrade
binaries)
- [ ] breaking change for on-chain data layout
- [ ] necessitate either a data wipe or data migration

### Release notes

.github/auto-merge.yml

@@ -0,0 +1,4 @@
+# Update Github actions automatically
+- match:
+    dependency_type: production
+    update_type: all

.github/dependabot.yml

@@ -7,14 +7,14 @@ updates:
   - package-ecosystem: "cargo"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "daily"
 
   - package-ecosystem: "npm"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "daily"
 
   - package-ecosystem: "github-actions"
     directory: "/"
     schedule:
-      interval: "weekly"
+      interval: "daily"

.github/workflows/dependabot-auto-merge.yml

@@ -44,7 +44,8 @@ jobs:
           git remote set-url origin https://x-access-token:${{ secrets.AUTOMERGE_TOKEN }}@github.com/${{ github.repository }}
           git commit -am "chore(deps): cargo hakari"
           git push
-      - uses: ahmadnassri/action-dependabot-auto-merge@45fc124d949b19b6b8bf6645b6c9d55f4f9ac61a # [email protected]
+      - name: Dependabot Auto Merge
+        uses: ahmadnassri/[email protected]
         with:
           github-token: ${{ secrets.AUTOMERGE_TOKEN }}
           command: 'squash and merge'