Add additional Dependabot ignore directives

This adds the other versioned Actions that should be managed by
cisagov/skeleton-generic to the list of commented out dependencies to
ignore.

Author: mcdonnnj

.github/dependabot.yml

@@ -15,7 +15,10 @@ updates:
     #   # 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: "/"