chore: enable version updates & grouped PR for Dependabot

Author: phanect

.github/dependabot.yml

@@ -6,7 +6,27 @@ updates:
       interval: "daily"
     assignees:
       - "phanect"
-    open-pull-requests-limit: 0 # Security updates only
+    groups:
+      security:
+        applies-to: "security-updates"
+        update-types:
+          - "minor"
+          - "patch"
+      security-breaking:
+        applies-to: "security-updates"
+        update-types:
+          - "major"
+      compatible:
+        applies-to: "version-updates"
+        update-types:
+          - "minor"
+          - "patch"
+      less-prioritized:
+        applies-to: "version-updates"
+        patterns:
+          - "eslint"
+          - "eslint-plugin-*"
+          - "eslint-config-*"
 
   - package-ecosystem: "github-actions"
     directory: "/"