Unused import (#3121)

* Unused import

* Partially revert "Unused import"

This reverts commit ff13739393b2f1926b18b4019cc642f5d9ed3dafi partially.

Author: DimitriPapadopoulos

tests/test_store/test_memory.py

@@ -8,8 +8,6 @@
 import pytest
 
 import zarr
-import zarr.core
-import zarr.core.array
 from zarr.core.buffer import Buffer, cpu, gpu
 from zarr.storage import GpuMemoryStore, MemoryStore
 from zarr.testing.store import StoreTests