ci: update Travis CI to Node.js 22 LTS

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

.travis.yml

@@ -1,6 +1,6 @@
 language: node_js
 node_js:
-  - "14"
+  - "22"
   - "node"
 install:
 - npm install