back out starlette upgrade, add warning suppression

Author: bhosmer-ant

pyproject.toml

@@ -26,7 +26,7 @@ dependencies = [
     "httpx>=0.27",
     "httpx-sse>=0.4",
     "pydantic>=2.7.2,<3.0.0",
-    "starlette>=0.46.2",
+    "starlette>=0.27",
     "sse-starlette>=1.6.1",
     "pydantic-settings>=2.5.2",
     "uvicorn>=0.23.1",
@@ -53,7 +53,6 @@ dev = [
     "pytest-flakefinder>=1.1.0",
     "pytest-xdist>=3.6.1",
     "pytest-examples>=0.0.14",
-    "starlette>=0.46.2",
 ]
 docs = [
     "mkdocs>=1.6.1",
@@ -114,5 +113,7 @@ filterwarnings = [
     # This should be fixed on Uvicorn's side.
     "ignore::DeprecationWarning:websockets",
     "ignore:websockets.server.WebSocketServerProtocol is deprecated:DeprecationWarning",
-    "ignore:Returning str or bytes.*:DeprecationWarning:mcp.server.lowlevel"
+    "ignore:Returning str or bytes.*:DeprecationWarning:mcp.server.lowlevel",
+    # this is a problem in starlette 0.27, which we're currently pinned to
+    "ignore:Please use `import python_multipart` instead.:PendingDeprecationWarning",
 ]