Fix: Resolving conflict and Changed the return type with phpstan.

system/Debug/Exceptions.php

@@ -100,6 +100,7 @@ public function __construct(ExceptionsConfig $config, $request, ResponseInterfac
      * @codeCoverageIgnore
      *
      * @return void
+     * @phpstan-return never|void
      */
     public function initialize()
     {
@@ -116,6 +117,7 @@ public function initialize()
      * @codeCoverageIgnore
      *
      * @return void
+     * @phpstan-return never|void
      */
     public function exceptionHandler(Throwable $exception)
     {
@@ -195,6 +197,7 @@ public function errorHandler(int $severity, string $message, ?string $file = nul
      * @codeCoverageIgnore
      *
      * @return void
+     * @phpstan-return never|void
      */
     public function shutdownHandler()
     {
@@ -251,6 +254,7 @@ protected function determineView(Throwable $exception, string $templatePath): st
      * Given an exception and status code will display the error to the client.
      *
      * @return void
+     * @phpstan-return never|void
      */
     protected function render(Throwable $exception, int $statusCode)
     {

system/Debug/Timer.php

@@ -132,7 +132,7 @@ public function has(string $name): bool
      * Returns its return value if any.
      *
      * @param string $name The name of the timer
-     * @phpstan-param callable():mixed $callable callable to be executed
+     * @phpstan-param callable(): mixed $callable callable to be executed
      *
      * @return array|bool|float|int|object|resource|string|null
      */

system/Debug/Toolbar.php

@@ -350,6 +350,7 @@ protected function roundTo(float $number, int $increments = 5): float
      * @param ResponseInterface $response
      *
      * @return void
+     * @phpstan-return never|void
      */
     public function prepare(?RequestInterface $request = null, ?ResponseInterface $response = null)
     {