python(chore): v0.16.1 prep (#577)

Author: wei-qlu

python/CHANGELOG.md

@@ -3,6 +3,11 @@ All notable changes to this project will be documented in this file.
 
 This project adheres to [Semantic Versioning](http://semver.org/).
 
+## [v0.16.1] - May 19, 2026
+
+### Bugfixes
+- Replace the POSIX-only `fcntl.flock` call in the test-results log with a cross-platform `filelock.FileLock` so importing `sift_client` no longer fails on Windows. ([#574](https://github.com/sift-stack/sift/pull/574))
+
 ## [v0.16.0] - May 14, 2026
 
 ### What's New

python/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "sift_stack_py"
-version = "0.16.0"
+version = "0.16.1"
 description = "Python client library for the Sift API"
 requires-python = ">=3.8"
 readme = { file = "README.md", content-type = "text/markdown" }