security(examples): update fastapi and uvicorn dependency pins in mac-agent (#155)

Co-authored-by: bhaba-va <165175947+bhaba-va@users.noreply.github.com>

Author: skynetcmd

examples/mac-agent/requirements.txt

@@ -1,5 +1,5 @@
-fastapi>=0.135.3,<1
-uvicorn[standard]>=0.44.0,<1
+fastapi>=0.136.1,<1
+uvicorn[standard]>=0.46.0,<1
 httpx>=0.28.1,<1
 sentence-transformers>=5.4.1,<6
 python-dotenv>=1.2.2,<2