🐛(y-provider) use CONVERSION_FILE_MAX_SIZE settings

The settings CONVERSION_FILE_MAX_SIZE was not used
in the y-provider, which caused a 413 Payload
Too Large error when trying to convert a file larger
than 500kb.
This commit updates the y-provider to use the
CONVERSION_FILE_MAX_SIZE settings, allowing it to
handle larger files without throwing an error.
CONVERSION_FILE_MAX_SIZE should follow the same
value as the one defined in the backend settings,
which is 20mb by default.

CHANGELOG.md

@@ -30,6 +30,7 @@ and this project adheres to
 - 🐛(frontend) fix broadcast store sync #1846
 - 🐛(helm) use celery resources instead of backend resources
 - 🐛(helm) reverse liveness and readiness for backend deployment
+- 🐛(y-provider) use CONVERSION_FILE_MAX_SIZE settings #1913
 
 ## [v4.5.0] - 2026-01-28