Enable PHP 8.1 version in Win builds

Author: Jeckerson

.github/workflows/ci.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
 
       matrix:
-        php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
+        php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
         arch: ['x86', 'x64']
         build_type: ['ts', 'nts']
 
@@ -62,6 +62,11 @@ jobs:
             vc_prefix: 'vs'
             os: windows-2019
 
+          - php: '8.1'
+            vc_num: 16
+            vc_prefix: 'vs'
+            os: windows-2019
+
     name: "PHP-${{ matrix.php }}-${{ matrix.build_type }}-win32-${{ matrix.vc_prefix }}${{ matrix.vc_num }}-${{ matrix.arch }}"
     runs-on: ${{ matrix.os}}