Tweak publish workflow

[newpavlov]

Removes the unnecessary extraction step and improves the grep command for extracting crate version from Cargo.toml.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.90%. Comparing base (adb876a) to head (f79a29c).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1215   +/-   ##
=======================================
  Coverage   87.90%   87.90%           
=======================================
  Files         184      184           
  Lines       21065    21065           
=======================================
  Hits        18517    18517           
  Misses       2548     2548           

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