Merge branch '5.4' into 6.0

* 5.4:
  Update ComposerPlugin.php
  [Notifier] [OvhCloud] handle invalid receiver
  [Cache] fix collecting cache stats when nesting computations
  [VarDumper] Fix JS to expand / collapse
  [Tests] Remove `$this` occurrences in future static data providers

Author: nicolas-grekas

Tests/EventListener/ErrorListenerTest.php

@@ -209,7 +209,7 @@ public function controllerProvider()
         }];
 
         yield [function ($exception) {
-            $this->assertInstanceOf(FlattenException::class, $exception);
+            static::assertInstanceOf(FlattenException::class, $exception);
 
             return new Response('OK: '.$exception->getMessage());
         }];