composer#11917 fix: Possibility to handle long URLs

(cherry picked from commit c7b91fc)

src/Composer/Repository/Vcs/GitDriver.php

@@ -52,7 +52,7 @@ public function initialize()
                 throw new \RuntimeException('GitDriver requires a usable cache directory, and it looks like you set it to be disabled');
             }
 
-            $this->repoDir = $this->config->get('cache-vcs-dir') . '/' . Preg::replace('{[^a-z0-9.]}i', '-', $this->url) . '/';
+            $this->repoDir = $this->config->get('cache-vcs-dir') . '/' . md5($this->url) . '/';
 
             GitUtil::cleanEnv();