chore(deps): bump postcss to 8.5.24, expand Dependabot config

.github/dependabot.yml

@@ -1,11 +1,28 @@
-# To get started with Dependabot version updates, you'll need to specify which
-# package ecosystems to update and where the package manifests are located.
-# Please see the documentation for all configuration options:
+# Dependabot version updates.
+# Security updates are enabled repo-wide and are not controlled by this file.
 # https://docs.github.com/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file
 
 version: 2
 updates:
-  - package-ecosystem: "npm" # also supports pnpm
+  - package-ecosystem: "npm" # also covers pnpm
     directory: "/"
     schedule:
       interval: "weekly"
+    open-pull-requests-limit: 5
+    # Group routine bumps so this is one PR a week, not five.
+    # Majors stay ungrouped — they get their own PR and a real review.
+    groups:
+      dev-dependencies:
+        dependency-type: "development"
+        update-types: ["minor", "patch"]
+      prod-dependencies:
+        dependency-type: "production"
+        update-types: ["minor", "patch"]
+
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    groups:
+      actions:
+        patterns: ["*"]