ci: update Node.js versions to 22 and 24

Drop support for Node.js 16, 18, 20, and 21.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: zkochan

.github/workflows/ci.yml

@@ -15,10 +15,8 @@ jobs:
       fail-fast: false
       matrix:
         node:
-          - '16.14'
-          - '18'
-          - '20'
-          - '21'
+          - '22'
+          - '24'
         platform:
           - ubuntu-latest
           - windows-latest