fix: move sniffio from test to runtime dependencies (#298)

sniffio is imported in production code
(deepset_cloud_sdk/workflows/async_client/files.py) to catch
AsyncLibraryNotFoundError, but was only listed as a test dependency.
This broke at runtime when anyio 4.0+ dropped sniffio as a transitive
dependency.

Resolves BUIG-13

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: ArzelaAscoIi

pyproject.toml

@@ -36,6 +36,7 @@ dependencies = [
   "pyrate-limiter>=3.7.0",
   "pydantic>=2.11.4",
   "ruamel.yaml>=0.18.10",
+  "sniffio>=1.3.1",
 ]
 
 [project.urls]
@@ -53,7 +54,6 @@ test = [
   "pytest-asyncio==1.2.0",
   "haystack-ai>=2.13.2",    # only for testing
   "respx==0.22.0",
-  "sniffio>=1.3.1",
 ]
 code-quality = [
   "ruff==0.14.7",