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>

tests/verifications/openai_api/conftest.py

@@ -18,7 +18,7 @@ def pytest_generate_tests(metafunc):
 
         try:
             config_data = _load_all_verification_configs()
-        except (FileNotFoundError, IOError) as e:
+        except (OSError, FileNotFoundError) as e:
             print(f"ERROR loading verification configs: {e}")
             config_data = {"providers": {}}
 

tests/verifications/openai_api/fixtures/fixtures.py

@@ -33,7 +33,7 @@ def _load_all_verification_configs():
     for config_path in yaml_files:
         provider_name = config_path.stem
         try:
-            with open(config_path, "r") as f:
+            with open(config_path) as f:
                 provider_config = yaml.safe_load(f)
                 if provider_config:
                     all_provider_configs[provider_name] = provider_config
@@ -41,7 +41,7 @@ def _load_all_verification_configs():
                     # Log warning if possible, or just skip empty files silently
                     print(f"Warning: Config file {config_path} is empty or invalid.")
         except Exception as e:
-            raise IOError(f"Error loading config file {config_path}: {e}") from e
+            raise OSError(f"Error loading config file {config_path}: {e}") from e
 
     return {"providers": all_provider_configs}
 
@@ -49,7 +49,7 @@ def _load_all_verification_configs():
 def case_id_generator(case):
     """Generate a test ID from the case's 'case_id' field, or use a default."""
     case_id = case.get("case_id")
-    if isinstance(case_id, (str, int)):
+    if isinstance(case_id, str | int):
         return re.sub(r"\\W|^(?=\\d)", "_", str(case_id))
     return None
 
@@ -77,7 +77,7 @@ def verification_config():
     """Pytest fixture to provide the loaded verification config."""
     try:
         return _load_all_verification_configs()
-    except (FileNotFoundError, IOError) as e:
+    except (OSError, FileNotFoundError) as e:
         pytest.fail(str(e))  # Fail test collection if config loading fails
 
 

tests/verifications/openai_api/fixtures/load.py

@@ -12,5 +12,5 @@ import yaml
 def load_test_cases(name: str):
     fixture_dir = Path(__file__).parent / "test_cases"
     yaml_path = fixture_dir / f"{name}.yaml"
-    with open(yaml_path, "r") as f:
+    with open(yaml_path) as f:
         return yaml.safe_load(f)