Support ecodev/graphql-upload v8

[andrew-demb]

There is a newly released major version of ecodev/graphql-upload - v8.0.0 https://github.com/Ecodev/graphql-upload/releases/tag/8.0.0

Release notes mention that UploadMiddleware is no longer presented in the library with no replacement and hint to implement PSR-15 middleware by ourselves in case of we need it (or to find an alternative library that provides a bridge between PSR-7 and ecodev/graphql-upload).

UploadMiddleware is currently used in GraphQLiteController.

graphqlite-bundle/src/Controller/GraphQLiteController.php

Lines 101 to 106 in 1c0d78e

	// Let's parse the request and adapt it for file uploads.
	if (class_exists(UploadMiddleware::class)) {
	$uploadMiddleware = new UploadMiddleware();
	$psr7Request = $uploadMiddleware->processRequest($psr7Request);
	\assert($psr7Request instanceof ServerRequestInterface);
	}