doc: update changelog for 1.1.2 release

Author: pkuwangh

CHANGELOG.md

@@ -3,6 +3,15 @@
 
 ## Latest
 
+## [1.1.2]
+
+### Released
+- 2025-08-28
+
+### Added
+- Upgrade to [cosmos-xenna 0.1.3](https://pypi.org/project/cosmos-xenna/0.1.3/) for improved scalability and observability.
+- Enable Semantic Deduplication on Ray and improve IO efficiency for improved throughput.
+
 ## [1.1.1]
 
 ### Released

pyproject.toml

@@ -15,7 +15,7 @@
 
 [project]
 name = "cosmos_curate"
-version = "1.0.0"
+version = "1.1.2"
 description = "Cosmos-Curate"
 readme = "README.md"
 authors = [