dependabot.yml: use exclude-paths, simplifying rules

Author: arl

dependabot.yml

@@ -4,13 +4,9 @@ updates:
     directory: "/"
     schedule:
       interval: "daily"
-    ignore:
-      - dependency-name: "*"
-        update-types:
-          ["version-update:semver-patch", "version-update:semver-minor"]
-    open-pull-requests-limit: 5
+    exclude-paths:
+      - "_example"
   - package-ecosystem: "npm"
     directory: "/internal/static"
     schedule:
       interval: "daily"
-    open-pull-requests-limit: 5