build: support Node.js 21.x in appveyor

UlisesGascon · UlisesGascon · commit 54ecfb7dee4c · 2024-02-02T16:31:54.000+01:00
diff --git a/appveyor.yml b/appveyor.yml
@@ -21,6 +21,7 @@ environment:
     - nodejs_version: "17.9"
     - nodejs_version: "18.15"
     - nodejs_version: "19.7"
+    - nodejs_version: "21.6.1"
 cache:
   - node_modules
 install:
