Remove extension 'intl' from PHP setup for testing (#912)

Author: thomascorthals

.github/workflows/run-tests.yml

@@ -30,7 +30,7 @@ jobs:
               uses: shivammathur/setup-php@v2
               with:
                 php-version: ${{ matrix.php }}
-                extensions: dom, curl, libxml, mbstring, zip, intl, iconv, json, simplexml
+                extensions: dom, curl, libxml, mbstring, zip, iconv, json, simplexml
                 ini-values: memory_limit=256M,post_max_size=256M
                 coverage: pcov