Deprecation notice: code_scanning_upload field will be removed from rate_limit API endpoint

GitHub is removing the `code_scanning_upload` field from the rate_limit REST API endpoint response on May 19, 2026. The field was misleading because it shared the same limit pool as the `core` category, causing confusion about rate limit status. Developers who parse the `/rate_limit` endpoint and reference this field must update their code before that date. The `core` rate limit will continue to govern code scanning uploads with no replacement field needed.