Ignore unclosed client sessions

Author: dstansby

pyproject.toml

@@ -403,12 +403,11 @@ filterwarnings = [
     "ignore:Creating a zarr.buffer.gpu.Buffer with an array that does not support the __cuda_array_interface__.*:UserWarning",
     "ignore:Automatic shard shape inference is experimental and may change without notice.*:UserWarning",
     "ignore:The codec .* is currently not part in the Zarr format 3 specification.*:UserWarning",
-    "ignore:The dtype .* is currently not part in the Zarr format 3 specification.*:UserWarning",
     "ignore:Use zarr.create_array instead.:DeprecationWarning",
     "ignore:Duplicate name.*:UserWarning",
     "ignore:The `compressor` argument is deprecated. Use `compressors` instead.:UserWarning",
     "ignore:Numcodecs codecs are not in the Zarr version 3 specification and may not be supported by other zarr implementations.:UserWarning",
-
+    "ignore:Unclosed client session <aiohttp.client.ClientSessionResourceWarning.*:ResourceWarning"
 ]
 markers = [
     "gpu: mark a test as requiring CuPy and GPU",