update imports in docs (#3591)

* update imports in docs

* fix tests

Author: d-v-b

docs/user-guide/arrays.md

@@ -213,7 +213,7 @@ built-in delta filter:
 
 ```python exec="true" session="arrays" source="above" result="ansi"
 import lzma
-from numcodecs.zarr3 import LZMA
+from zarr.codecs.numcodecs import LZMA
 
 lzma_filters = [dict(id=lzma.FILTER_DELTA, dist=4), dict(id=lzma.FILTER_LZMA2, preset=1)]
 compressors = LZMA(filters=lzma_filters)
@@ -251,7 +251,7 @@ mechanism for configuring filters outside of the primary compressor.
 Here is an example using a delta filter with the Blosc compressor:
 
 ```python exec="true" session="arrays" source="above" result="ansi"
-from numcodecs.zarr3 import Delta
+from zarr.codecs.numcodecs import Delta
 
 filters = [Delta(dtype='int32')]
 compressors = zarr.codecs.BloscCodec(cname='zstd', clevel=1, shuffle=zarr.codecs.BloscShuffle.shuffle)

tests/test_regression/scripts/v3.0.8.py

@@ -1,7 +1,8 @@
 # /// script
 # requires-python = "==3.12"
 # dependencies = [
-#  "zarr==3.0.8"
+#  "zarr==3.0.8",
+#  "numcodecs==0.16.3"
 # ]
 # ///