Add Node 22 to CI test matrix

Author: mattt

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     strategy:
       matrix:
         # See supported Node.js release schedule at https://nodejs.org/en/about/previous-releases
-        node-version: [18.x, 20.x]
+        node-version: [18.x, 20.x, 22.x]
 
     steps:
       - uses: actions/checkout@v4