fix ci: some linting issues (#852)

Author: jjmachan

src/ragas/metrics/base.py

@@ -52,11 +52,13 @@ def get_required_columns(
 class Metric(ABC):
     @property
     @abstractmethod
-    def name(self) -> str: ...
+    def name(self) -> str:
+        ...
 
     @property
     @abstractmethod
-    def evaluation_mode(self) -> EvaluationMode: ...
+    def evaluation_mode(self) -> EvaluationMode:
+        ...
 
     @abstractmethod
     def init(self, run_config: RunConfig):
@@ -118,9 +120,8 @@ async def ascore(
         return score
 
     @abstractmethod
-    async def _ascore(
-        self, row: t.Dict, callbacks: Callbacks, is_async: bool
-    ) -> float: ...
+    async def _ascore(self, row: t.Dict, callbacks: Callbacks, is_async: bool) -> float:
+        ...
 
 
 @dataclass