Update test commands in RELEASING.rst etc. #593
Description
Due to changes to pytpoject.toml, ``pip install blosc2[test]" does not access the dependency group and so must be changed to new syntax (possibly using uv or poetry).
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Due to changes to pytpoject.toml, ``pip install blosc2[test]" does not access the dependency group and so must be changed to new syntax (possibly using uv or poetry).