(CONT-236) Update dependabot

This commit replaces the existing dependabot config with a much simpler
set of options. This option-set will be used across all gems.

Author: chelnak

.github/dependabot.yml

@@ -1,15 +1,11 @@
 version: 2
 updates:
-- package-ecosystem: bundler
-  directory: "/"
-  schedule:
-    interval: daily
-    time: "13:00"
-  open-pull-requests-limit: 10
-  ignore:
-  - dependency-name: rubocop
-    versions:
-    - "> 0.49, < 1"
-  - dependency-name: rubocop
-    versions:
-    - ">= 1.a, < 2"
+  - package-ecosystem: "bundler"
+    directory: "/" #
+    schedule:
+      interval: "weekly"
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"