ci(dependabot): ignore semver-major updates for unidic@5 (#3484)

Author: char0n

.github/dependabot.yml

@@ -11,6 +11,11 @@ updates:
   open-pull-requests-limit: 10
   ignore:
     - dependency-name: "traverse"
+    - dependency-name: "undici" # we need to stay on unidici@5 for testing on Node.js@16
+      dependency-type: "development"
+      update-types:
+        - "version-update:semver-major"
+
 
 - package-ecosystem: "github-actions"
   target-branch: "master"