Update appveyor.yml

Author: bago

appveyor.yml

@@ -1,8 +1,7 @@
 environment:
   matrix:
-    - nodejs_version: "15"
-    - nodejs_version: "16"
     - nodejs_version: "18"
+    - nodejs_version: "22"
 
 platform:
   - x86
@@ -24,4 +23,4 @@ test_script:
   - npm test
 
 # Don't actually build.
-build: off
+build: off