Fix the serve command sometimes fails to destructure the request pool array (#55427)

The code expects the array to always contain 3 items, but apparently
that's not always true. Sometimes it only contains a single key "1" with
the file that was requested (when PHP serves a file).

I don't know the root cause yet, but this patch seems to work around
that.

Author: tonysm

src/Illuminate/Foundation/Console/ServeCommand.php

@@ -335,7 +335,7 @@ protected function flushOutputBuffer()
                 } elseif ((new Stringable($line))->contains(' Closing')) {
                     $requestPort = static::getRequestPortFromLine($line);
 
-                    if (empty($this->requestsPool[$requestPort])) {
+                    if (empty($this->requestsPool[$requestPort]) || count($this->requestsPool[$requestPort] ?? []) !== 3) {
                         $this->requestsPool[$requestPort] = [
                             $this->getDateFromLine($line),
                             false,