PP-7685 Update Dependabot configuration

.github/dependabot.yml

@@ -3,8 +3,52 @@ updates:
   - package-ecosystem: bundler
     directory: /
     schedule:
-      interval: daily
+      interval: weekly
+      day: tuesday
+      time: "07:00"
+    allow:
+      - dependency-type: direct
+    cooldown:
+      default-days: 3
+    open-pull-requests-limit: 25
+    groups:
+      test:
+        patterns:
+          - "benchmark"
+          - "database_cleaner"
+          - "pry"
+          - "rack-test"
+          - "rspec"
+          - "rspec-*"
+          - "simplecov"
+      lint:
+        patterns:
+          - "rubocop"
+          - "rubocop-*"
+
   - package-ecosystem: github-actions
     directory: /
     schedule:
-      interval: daily
+      interval: weekly
+      day: tuesday
+      time: "07:00"
+    cooldown:
+      default-days: 3
+    open-pull-requests-limit: 25
+
+  # Ruby needs to be upgraded manually in multiple places, so cannot
+  # be upgraded by Dependabot. That effectively makes the below
+  # config redundant, as ruby is the only updatable thing in the
+  # Dockerfile, although this may change in the future. We hope this
+  # config will save a dev from trying to upgrade ruby via Dependabot.
+  - package-ecosystem: docker
+    directory: /
+    ignore:
+      - dependency-name: ruby
+    schedule:
+      interval: weekly
+      day: tuesday
+      time: "07:00"
+    cooldown:
+      default-days: 7
+    open-pull-requests-limit: 25