Update test.yml

Author: kawax

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
         uses: shivammathur/setup-php@v2 #https://github.com/shivammathur/setup-php
         with:
           php-version: 8.3
-          extensions: mbstring, bcmath
+          extensions: mbstring
           coverage: xdebug
       - name: Install Composer dependencies
         run: composer install -q