Update p2panda-rs to v0.8.1

[adzialocha]

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (8e21b6a) 92.31% compared to head (bbf83ed) 92.30%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #599      +/-   ##
==========================================
- Coverage   92.31%   92.30%   -0.01%     
==========================================
  Files         109      109              
  Lines       18662    18662              
==========================================
- Hits        17227    17226       -1     
- Misses       1435     1436       +1     

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