Apply ruff/flake8-simplify rule SIM105

SIM105 Use `contextlib.suppress(KeyError)` instead of `try`-`except`-`pass`

Author: DimitriPapadopoulos

src/zarr/storage/memory.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import contextlib
 from logging import getLogger
 from typing import TYPE_CHECKING, Self