chore: group minor and patch level

This will make dependabot group minor and patch level ruby dependency
updates together into one pull request. This will greatly reduce the
number of open pull requests that maintainer will have to manage.

Author: mroderick

.github/dependabot.yml

@@ -5,6 +5,13 @@ updates:
   schedule:
     interval: weekly
   open-pull-requests-limit: 10
+  groups:
+    ruby-deps:
+      update-types:
+      - "minor"
+      - "patch"
+      patterns:
+      - "*"
   ignore:
   - dependency-name: pg
     versions: