feat: drop python 3.10 support (#2469)

# What does this PR do?

dropped python3.10, updated pyproject and dependencies, and also removed
some blocks of code with special handling for enum.StrEnum

Closes #2458

Signed-off-by: Charlie Doern <cdoern@redhat.com>

llama_stack/distribution/server/auth_providers.py

@@ -9,12 +9,12 @@ import time
 from abc import ABC, abstractmethod
 from asyncio import Lock
 from pathlib import Path
+from typing import Self
 from urllib.parse import parse_qs
 
 import httpx
 from jose import jwt
 from pydantic import BaseModel, Field, field_validator, model_validator
-from typing_extensions import Self
 
 from llama_stack.distribution.datatypes import AuthenticationConfig, AuthProviderType, User
 from llama_stack.log import get_logger

llama_stack/distribution/server/quota.py

@@ -6,7 +6,7 @@
 
 import json
 import time
-from datetime import datetime, timedelta, timezone
+from datetime import UTC, datetime, timedelta
 
 from starlette.types import ASGIApp, Receive, Scope, Send
 
@@ -79,7 +79,7 @@ class QuotaMiddleware:
 
                 if int(prev) == 0:
                     # Set with expiration datetime when it is the first request in the window.
-                    expiration = datetime.now(timezone.utc) + timedelta(seconds=self.window_seconds)
+                    expiration = datetime.now(UTC) + timedelta(seconds=self.window_seconds)
                     await kv.set(key, str(count), expiration=expiration)
                 else:
                     await kv.set(key, str(count))

llama_stack/distribution/server/server.py

@@ -145,7 +145,7 @@ async def shutdown(app):
                 await asyncio.wait_for(impl.shutdown(), timeout=5)
             else:
                 logger.warning("No shutdown method for %s", impl_name)
-        except (asyncio.TimeoutError, TimeoutError):
+        except TimeoutError:
             logger.exception("Shutdown timeout for %s ", impl_name, exc_info=True)
         except (Exception, asyncio.CancelledError) as e:
             logger.exception("Failed to shutdown %s: %s", impl_name, {e})