Include fileinfo in the CI extensions...

This is so the tests would pass for PHP 8.0 in Windows.

Author: amcsi

.github/workflows/run-tests.yml

@@ -39,7 +39,7 @@ jobs:
                 uses: shivammathur/setup-php@v2
                 with:
                     php-version: ${{ matrix.php }}
-                    extensions: curl, dom, libxml, mbstring, pdo, sqlite, pdo_sqlite, zip
+                    extensions: curl, dom, fileinfo, libxml, mbstring, pdo, sqlite, pdo_sqlite, zip
                     coverage: pcov
 
             -   name: Install dependencies