Fix HTTP/2 window size for too large uploads

Too large uploads will simply hang otherwise, because the window isn't increased anymore to receive the byte triggering the too large payload error.

src/Driver/Http2Driver.php

@@ -1089,12 +1089,14 @@ public function handleData(int $streamId, string $data): void
                 }
 
                 $increment = \min(
-                    $stream->maxBodySize - $stream->received - $stream->serverWindow,
+                    $stream->maxBodySize + 1 - $stream->received - $stream->serverWindow,
                     self::MAX_INCREMENT
                 );
+
                 if ($increment <= 0) {
                     return;
                 }
+
                 $stream->serverWindow += $increment;
 
                 $this->writeFrame(