Use Dependabot for GitHub Actions

Closes gh-18648

Signed-off-by: Josh Cummings <3627351+jzheaux@users.noreply.github.com>

Author: jzheaux

.github/dependabot.yml

@@ -110,6 +110,30 @@ updates:
       - 'type: task'
       - 'in: build'
 
+  - package-ecosystem: github-actions
+    target-branch: main
+    schedule:
+      interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
+
+  - package-ecosystem: github-actions
+    target-branch: 7.0.x
+    schedule:
+      interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
+
+  - package-ecosystem: github-actions
+    target-branch: 6.5.x
+    schedule:
+      interval: weekly
+    labels:
+      - 'type: task'
+      - 'in: build'
+
   - package-ecosystem: 7.0.x
     target-branch: main
     directory: /docs