refactor: change typing annotations in tests folder (#3594)

* refactor(log_router.py): change variable type annotation from List to list for better consistency
refactor(utils.py): change variable type annotation from Dict to dict for better consistency
refactor(base.py): change variable type annotation from Optional to Union for better clarity
refactor(callback.py): change variable type annotation from Dict to dict for better consistency
refactor(chat.py): change variable type annotation from Optional to Union for better clarity
refactor(endpoints.py): change variable type annotation from Optional to Union for better clarity
refactor(flows.py): change variable type annotation from List to list for better consistency

refactor(api): update response_model annotations to use lowercase list for consistency and improve readability

refactor(store.py): update type annotations for query parameters in get_components endpoint to improve code readability and maintainability
feat(store.py): add support for type hinting Union and list types in query parameters for better data validation and documentation

* run make format

* refactor(input_mixin.py): update typing annotations for variables to use union types for better clarity and compatibility with Python 3.10
refactor(inputs.py): update typing annotations for variables to use union types and import necessary modules for compatibility with Python 3.10

* refactor(base.py): remove unnecessary imports and update typing for fields in Input and Output classes
feat(base.py): add support for specifying field types more explicitly in Input and Output classes
feat(frontend_node/base.py): enhance typing and field definitions in FrontendNode class
feat(frontend_node/custom_components.py): improve typing and field definitions in CustomComponentFrontendNode and ComponentFrontendNode classes
feat(template/base.py): update typing for fields in Template class and remove unnecessary imports

* refactor(inputs): remove unnecessary Optional import from typing in input_mixin.py and inputs.py files to improve code readability and maintainability

* refactor(schema.py): change 'Type' to 'type' for consistency in type annotations
refactor(schema.py): change 'list' to 'List' and 'Literal' to 'literal' for correct type hinting in create_input_schema function

* refactor(utils.py): change typing annotations from List and Union to list and type to follow PEP 585 standards
refactor(test_schema.py): change typing annotations from List and List to list and list to follow PEP 585 standards
refactor(test_graph.py): change typing annotations from Type and Union to type and Vertex | None to follow PEP 585 standards
refactor(test_io_schema.py): change typing annotations from List and List to list and list to follow PEP 585 standards
refactor(test_custom_component.py): update file reading method to remove unnecessary "r" mode
refactor(test_helper_components.py): update file reading method to remove unnecessary "r" mode
refactor(test_kubernetes_secrets.py): update b64encode method argument to bytes type
refactor(test_template.py): change typing annotations from Optional, List, and Dict to list, dict, and None to follow PEP 585 standards

* [autofix.ci] apply automated fixes

---------

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

src/backend/tests/unit/test_template.py

@@ -1,5 +1,4 @@
 import importlib
-from typing import Dict, List, Optional
 
 import pytest
 from langflow.utils.util import build_template_from_function, get_base_classes, get_default_factory
@@ -27,14 +26,14 @@ class Child(Parent):
 class ExampleClass1(BaseModel):
     """Example class 1."""
 
-    def __init__(self, data: Optional[List[int]] = None):
+    def __init__(self, data: list[int] | None = None):
         self.data = data or [1, 2, 3]
 
 
 class ExampleClass2(BaseModel):
     """Example class 2."""
 
-    def __init__(self, data: Optional[Dict[str, int]] = None):
+    def __init__(self, data: dict[str, int] | None = None):
         self.data = data or {"a": 1, "b": 2, "c": 3}