Try to use fixed appveyour ps script for build

Author: AlexNDRmac

.appveyor.yml

@@ -64,7 +64,8 @@ environment:
       APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
 
   PHP_SDK_VERSION: 2.1.9
-  PHP_AVM: https://raw.githubusercontent.com/sergeyklay/php-appveyor/master/php-appveyor.psm1
+  # PHP_AVM: https://raw.githubusercontent.com/sergeyklay/php-appveyor/master/php-appveyor.psm1
+  PHP_AVM: https://raw.githubusercontent.com/AlexNDRmac/php-appveyor/fix-for-php8/php-appveyor.psm1
 
   TEST_PHP_EXECUTABLE: C:\php\php.exe
   NO_INTERACTION: 1