Fix processing REQUEST_TIME_FLOAT value

Avoid using float when parsing REQUEST_TIME_FLOAT,
as it may be formatted with a comma, depending on the locale.

Otherwise, get this notice when passing 1649168503,0729 to date:
> PHP Notice:  A non well formed numeric value encountered

Author: glensc

src/ProfilingData.php

@@ -25,7 +25,7 @@ public function getProfilingData(array $profile)
     {
         $url = $this->getUrl();
 
-        $requestTimeFloat = explode('.', $_SERVER['REQUEST_TIME_FLOAT']);
+        $requestTimeFloat = explode('.', sprintf('%.6F', $_SERVER['REQUEST_TIME_FLOAT']));
         if (!isset($requestTimeFloat[1])) {
             $requestTimeFloat[1] = 0;
         }