Deprecate Streamlit SDK in spaces changelog

Author: hysts

docs/hub/spaces-changelog.md

@@ -1,5 +1,9 @@
 # Spaces Changelog
 
+## [2025-04-30] - Deprecate Streamlit SDK
+
+- Streamlit is no longer provided as a standard SDK option. Streamlit applications are now created using the Docker template.
+
 ## [2023-07-28] - Upstream Streamlit frontend for `>=1.23.0`
 
 - Streamlit SDK uses the upstream packages published on PyPI for `>=1.23.0`, so the newly released versions are available from the day of release.