feat: upgrade psvm to 0.3.1

[moliholy]

This PR upgrades psvm to 0.3.1, which includes paritytech/psvm#36 to use the GITHUB_TOKEN environment variable for querying github API without requiring the gh binary present in the system.

[moliholy]

Related issue: #768

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.03%. Comparing base (e9004c4) to head (872caae).
⚠️ Report is 1 commits behind head on main.

@@           Coverage Diff           @@
##             main     #792   +/-   ##
=======================================
  Coverage   76.03%   76.03%           
=======================================
  Files         115      115           
  Lines       26306    26306           
  Branches    26306    26306           
=======================================
  Hits        20002    20002           
  Misses       4170     4170           
  Partials     2134     2134           

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