update pcodec

[mwlon]

Fixes #815 . Updated to >=v1, which has various improvements.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.33%. Comparing base (e0ddee6) to head (097931e).

❌ Your project check has failed because the head coverage (99.33%) is below the target coverage (100.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #817   +/-   ##
=======================================
  Coverage   99.33%   99.33%           
=======================================
  Files          26       26           
  Lines         898      898           
=======================================
  Hits          892      892           
  Misses          6        6           

Files with missing lines	Coverage Δ
numcodecs/pcodec.py	100.00% <100.00%> (ø)

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[mwlon]

CI appears to be failing for unrelated reasons.