style: fix linter violations

Author: joaodaher

src/fastapi_cloudflow/core/arg.py

@@ -47,8 +47,5 @@ def expr(expression: str) -> ArgExpr:
 
     @staticmethod
     def base64(value: str | ArgExpr) -> ArgExpr:
-        if isinstance(value, ArgExpr):
-            inner = value.expr
-        else:
-            inner = json.dumps(value)
+        inner = value.expr if isinstance(value, ArgExpr) else json.dumps(value)
         return ArgExpr(f"base64.encode({inner})")

src/fastapi_cloudflow/core/connectors.py

@@ -88,7 +88,7 @@ class PubSubPublishResult(BaseModel):
     message_ids: list[str]
 
 
-def pubsub_publish_step(
+def pubsub_publish_step[InT: BaseModel, OutT: BaseModel](
     *,
     name: str,
     topic: str,