composer install with "--prefer-dist" fails. Remove that flag.

Author: nathanjrobertson

.github/workflows/php.yml

@@ -240,7 +240,7 @@ jobs:
           restore-keys: ${{ runner.os }}-composer-
 
       - name: Install Composer dependencies
-        run: composer install --no-progress --prefer-dist --optimize-autoloader --ignore-platform-req=ext-posix
+        run: composer install --no-progress --optimize-autoloader --ignore-platform-req=ext-posix
 
       - name: Run unit tests
         run: vendor/bin/phpunit --no-coverage