build: support Node.js 21.x in appveyor

UlisesGascon · UlisesGascon · commit b9fea1224516 · 2024-02-26T20:06:49.000+01:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -22,6 +22,7 @@ environment:
     - nodejs_version: "18.19"
     - nodejs_version: "19.9"
     - nodejs_version: "20.11"
+    - nodejs_version: "21.6.1"
 cache:
   - node_modules
 install:
