Fix param nullability

phpstan/baseline.neon

@@ -4260,6 +4260,16 @@ parameters:
 			count: 2
 			path: ../src/Composer/Repository/PathRepository.php
 
+		-
+			message: "#^Constructor of class Composer\\\\Repository\\\\PathRepository has an unused parameter \\$dispatcher\\.$#"
+			count: 1
+			path: ../src/Composer/Repository/PathRepository.php
+
+		-
+			message: "#^Constructor of class Composer\\\\Repository\\\\PathRepository has an unused parameter \\$httpDownloader\\.$#"
+			count: 1
+			path: ../src/Composer/Repository/PathRepository.php
+
 		-
 			message: "#^Only booleans are allowed in &&, string\\|false given on the right side\\.$#"
 			count: 1

src/Composer/Repository/PathRepository.php

@@ -111,7 +111,7 @@ class PathRepository extends ArrayRepository implements ConfigurableRepositoryIn
      * @param IOInterface $io
      * @param Config      $config
      */
-    public function __construct(array $repoConfig, IOInterface $io, Config $config, HttpDownloader $httpDownloader, EventDispatcher $dispatcher = null, ProcessExecutor $process = null)
+    public function __construct(array $repoConfig, IOInterface $io, Config $config, HttpDownloader $httpDownloader = null, EventDispatcher $dispatcher = null, ProcessExecutor $process = null)
     {
         if (!isset($repoConfig['url'])) {
             throw new \RuntimeException('You must specify the `url` configuration for the path repository');