[router] upgrade router version to 0.1.9 (#8844)

Author: slin1237

sgl-router/py_src/sglang_router/version.py

@@ -1 +1 @@
-__version__ = "0.1.8"
+__version__ = "0.1.9"

sgl-router/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sglang-router"
-version = "0.1.8"
+version = "0.1.9"
 description = "High-performance Rust-based load balancer for SGLang with multiple routing algorithms and prefill-decode disaggregation support"
 authors = [{name = "Byron Hsu", email = "byronhsu1230@gmail.com"}]
 requires-python = ">=3.8"