[JsonStreamer] update .gitattributes paths for JsonStreamer

Author: santysisi

.gitattributes

@@ -7,7 +7,7 @@
 /src/Symfony/Component/Translation/Bridge export-ignore
 /src/Symfony/Component/Emoji/Resources/data/* linguist-generated=true
 /src/Symfony/Component/Intl/Resources/data/*/* linguist-generated=true
-/src/Symfony/Component/JsonEncoder/Tests/Fixtures/encoder/* linguist-generated=true
-/src/Symfony/Component/JsonEncoder/Tests/Fixtures/decoder/* linguist-generated=true
+/src/Symfony/Component/JsonStreamer/Tests/Fixtures/stream_writer/* linguist-generated=true
+/src/Symfony/Component/JsonStreamer/Tests/Fixtures/stream_reader/* linguist-generated=true
 /src/Symfony/**/.github/workflows/close-pull-request.yml linguist-generated=true
 /src/Symfony/**/.github/PULL_REQUEST_TEMPLATE.md linguist-generated=true