Update dependencies: semantic-kernel to 1.39.4 and mcp to 1.26.0

Author: Ayaz-Microsoft

src/backend/pyproject.toml

@@ -27,11 +27,11 @@ dependencies = [
     "pytest-cov==5.0.0",
     "python-dotenv==1.1.1",
     "python-multipart==0.0.20",
-    "semantic-kernel==1.39.3",
+    "semantic-kernel==1.39.4",
     "uvicorn==0.35.0",
     "pylint-pydantic==0.3.5",
     "pexpect==4.9.0",
-    "mcp==1.23.0",
+    "mcp==1.26.0",
     "werkzeug==3.1.5",
     "azure-core==1.38.0",
     "agent-framework>=1.0.0b251105",