build: free upper limit on httpx version (#289)

Co-authored-by: Manikanth Sai <[email protected]>

Author: RobPasMue

pyproject.toml

@@ -27,7 +27,7 @@ classifiers = [
 ]
 dependencies = [
     "pydantic>=2.7.1",
-    "httpx>=0.27.0,<0.28.0",
+    "httpx>=0.27.0",
     "backoff>=2.2.1",
     "humanfriendly>=10.0",
     "requests>=2.21.0",