Revert "#110 - Add PHP 8.1"

This reverts commit 8ee7d58.

Author: Jeckerson

.github/workflows/windows.yml

@@ -27,7 +27,7 @@ jobs:
       fail-fast: false
 
       matrix:
-        php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        php: ['7.0', '7.1', '7.2', '7.3', '7.4', '8.0']
         arch: ['x86', 'x64']
         build_type: ['ts', 'nts']
 
@@ -62,11 +62,6 @@ 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}}