Enable dependabot ignore directives

Enable the dependabot ignore directives for GitHub Actions
dependencies.

Author: mcdonnnj

.github/dependabot.yml

@@ -11,14 +11,14 @@ updates:
     directory: "/"
     schedule:
       interval: "weekly"
-    # ignore:
-    #   # Managed by cisagov/skeleton-generic
-    #   - dependency-name: actions/cache
-    #   - dependency-name: actions/checkout
-    #   - dependency-name: actions/setup-go
-    #   - dependency-name: actions/setup-python
-    #   - dependency-name: hashicorp/setup-terraform
-    #   - dependency-name: mxschmitt/action-tmate
+    ignore:
+      # Managed by cisagov/skeleton-generic
+      - dependency-name: actions/cache
+      - dependency-name: actions/checkout
+      - dependency-name: actions/setup-go
+      - dependency-name: actions/setup-python
+      - dependency-name: hashicorp/setup-terraform
+      - dependency-name: mxschmitt/action-tmate
 
   - package-ecosystem: "pip"
     directory: "/"