test: fix type annotations in dependency injection tests

Fixed missing type arguments in dict type annotations to satisfy
pyright type checking requirements.

Changed:
- dict -> dict[str, str] in test functions

Author: peter-luminova

tests/server/mcpserver/utilities/test_dependencies.py

@@ -101,10 +101,10 @@ def get_value() -> str:
 
     @pytest.mark.anyio
     async def test_resolve_nested_dependency(self):
-        def get_config() -> dict:
+        def get_config() -> dict[str, str]:
             return {"db_url": "test"}
 
-        def get_db(config: dict = Depends(get_config)) -> str:
+        def get_db(config: dict[str, str] = Depends(get_config)) -> str:
             return config["db_url"]
 
         resolver = DependencyResolver()
@@ -140,10 +140,10 @@ async def get_async_value() -> str:
 
     @pytest.mark.anyio
     async def test_resolve_nested_async_dependency(self):
-        async def get_config() -> dict:
+        async def get_config() -> dict[str, str]:
             return {"db_url": "test_async"}
 
-        async def get_db(config: dict = Depends(get_config)) -> str:
+        async def get_db(config: dict[str, str] = Depends(get_config)) -> str:
             return config["db_url"]
 
         resolver = DependencyResolver()