Fix force_flush signature to match base class

Author: Manvi2402

processor/opentelemetry-processor-baggage/src/opentelemetry/processor/baggage/log_processor.py

@@ -76,6 +76,5 @@ def on_emit(self, log_record: ReadWriteLogRecord) -> None:
     def shutdown(self) -> None:
         pass
 
-    @staticmethod
-    def force_flush(timeout_millis: int = 30000) -> bool:
+    def force_flush(self, timeout_millis: int = 30000) -> bool:
         return True