Apply ruff/refurb rule FURB188

FURB188 Prefer `removesuffix` over conditionally replacing with slice.

Author: DimitriPapadopoulos

src/zarr/storage/memory.py

@@ -156,8 +156,7 @@ async def list_prefix(self, prefix: str) -> AsyncGenerator[str, None]:
 
     async def list_dir(self, prefix: str) -> AsyncGenerator[str, None]:
         # docstring inherited
-        if prefix.endswith("/"):
-            prefix = prefix[:-1]
+        prefix = prefix.removesuffix("/")
 
         if prefix == "":
             keys_unique = {k.split("/")[0] for k in self._store_dict}

src/zarr/storage/zip.py

@@ -245,8 +245,7 @@ async def list_prefix(self, prefix: str) -> AsyncGenerator[str, None]:
 
     async def list_dir(self, prefix: str) -> AsyncGenerator[str, None]:
         # docstring inherited
-        if prefix.endswith("/"):
-            prefix = prefix[:-1]
+        prefix = prefix.removesuffix("/")
 
         keys = self._zf.namelist()
         seen = set()