Drop EOL Node 21 and add Node 22 in CI

Author: marcoroth

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node: [18, 19, 20, 21]
+        node: [18, 20, 22]
 
     steps:
       - uses: actions/checkout@v4