chore: enable pyupgrade fixes (#1806)

# What does this PR do?

The goal of this PR is code base modernization.

Schema reflection code needed a minor adjustment to handle UnionTypes
and collections.abc.AsyncIterator. (Both are preferred for latest Python
releases.)

Note to reviewers: almost all changes here are automatically generated
by pyupgrade. Some additional unused imports were cleaned up. The only
change worth of note can be found under `docs/openapi_generator` and
`llama_stack/strong_typing/schema.py` where reflection code was updated
to deal with "newer" types.

Signed-off-by: Ihar Hrachyshka <ihar.hrachyshka@gmail.com>

llama_stack/providers/inline/safety/code_scanner/__init__.py

@@ -4,12 +4,12 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from typing import Any, Dict
+from typing import Any
 
 from .config import CodeScannerConfig
 
 
-async def get_provider_impl(config: CodeScannerConfig, deps: Dict[str, Any]):
+async def get_provider_impl(config: CodeScannerConfig, deps: dict[str, Any]):
     from .code_scanner import MetaReferenceCodeScannerSafetyImpl
 
     impl = MetaReferenceCodeScannerSafetyImpl(config, deps)

llama_stack/providers/inline/safety/code_scanner/code_scanner.py

@@ -5,7 +5,7 @@
 # the root directory of this source tree.
 
 import logging
-from typing import Any, Dict, List
+from typing import Any
 
 from llama_stack.apis.inference import Message
 from llama_stack.apis.safety import (
@@ -48,8 +48,8 @@ class MetaReferenceCodeScannerSafetyImpl(Safety):
     async def run_shield(
         self,
         shield_id: str,
-        messages: List[Message],
-        params: Dict[str, Any] = None,
+        messages: list[Message],
+        params: dict[str, Any] = None,
     ) -> RunShieldResponse:
         shield = await self.shield_store.get_shield(shield_id)
         if not shield:

llama_stack/providers/inline/safety/code_scanner/config.py

@@ -4,12 +4,12 @@
 # This source code is licensed under the terms described in the LICENSE file in
 # the root directory of this source tree.
 
-from typing import Any, Dict
+from typing import Any
 
 from pydantic import BaseModel
 
 
 class CodeScannerConfig(BaseModel):
     @classmethod
-    def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> Dict[str, Any]:
+    def sample_run_config(cls, __distro_dir__: str, **kwargs: Any) -> dict[str, Any]:
         return {}