fix: make pcodec compatible with numcodecs

[LDeakin]

This should be compatible with the next numcodecs release.

Fixes #111

[codecov]

Codecov Report

Attention: Patch coverage is 44.89796% with 27 lines in your changes missing coverage. Please review.

Project coverage is 81.65%. Comparing base (8f508b0) to head (55cc617).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../array/codec/array_to_bytes/pcodec/pcodec_codec.rs	28.94%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #122      +/-   ##
==========================================
+ Coverage   81.61%   81.65%   +0.04%     
==========================================
  Files         167      167              
  Lines       23842    23765      -77     
==========================================
- Hits        19458    19405      -53     
+ Misses       4384     4360      -24     

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