Bugfix protocol typing

As per python/mypy#5385 the protocol
AsyncGenerator method should be a `def` not `async def`.

src/quart_db/backends/aiosqlite.py

@@ -125,7 +125,7 @@ async def fetch_val(
         else:
             return result[0]
 
-    async def iterate(  # type: ignore[override]
+    async def iterate(
         self,
         query: str,
         values: Optional[Dict[str, Any]] = None,

src/quart_db/backends/asyncpg.py

@@ -119,7 +119,7 @@ async def fetch_val(
         except asyncpg.exceptions.UndefinedParameterError as error:
             raise UndefinedParameterError(str(error))
 
-    async def iterate(  # type: ignore[override]
+    async def iterate(
         self,
         query: str,
         values: Optional[Dict[str, Any]] = None,

src/quart_db/interfaces.py

@@ -93,7 +93,7 @@ async def fetch_val(self, query: str, values: Optional[Dict[str, Any]] = None) -
         pass
 
     @abstractmethod
-    async def iterate(
+    def iterate(
         self,
         query: str,
         values: Optional[Dict[str, Any]] = None,

tests/test_connection.py

@@ -35,10 +35,7 @@ async def test_iterate(connection: Connection) -> None:
         "INSERT INTO tbl (data) VALUES (:data)",
         [{"data": 2}, {"data": 3}],
     )
-    assert [2, 3] == [
-        result["data"]
-        async for result in connection.iterate("SELECT data FROM tbl")  # type: ignore
-    ]
+    assert [2, 3] == [result["data"] async for result in connection.iterate("SELECT data FROM tbl")]
 
 
 async def test_transaction(connection: Connection) -> None: