fix: f string in TCA

Author: chaen

src/DIRAC/TransformationSystem/Agent/TransformationCleaningAgent.py

@@ -684,7 +684,7 @@ def __submitRemovalRequests(self, lfns, transID=0):
 
         for index, lfnList in enumerate(breakListIntoChunks(lfns, 300)):
             oRequest = Request()
-            requestName = "TCA_{transID}_{index}_{md5(repr(time.time()).encode()).hexdigest()[:5]}"
+            requestName = f"TCA_{transID}_{index}_{md5(repr(time.time()).encode()).hexdigest()[:5]}"
             oRequest.RequestName = requestName
             oOperation = Operation()
             oOperation.Type = "RemoveFile"