Cargo.toml: Update strum to 0.27

[mcronce]

Keeping the >=0.24 bound; just allowing a maximum of 0.27, instead of 0.26.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.36%. Comparing base (1d11bec) to head (383daa2).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #97      +/-   ##
==========================================
+ Coverage   67.33%   67.36%   +0.03%     
==========================================
  Files          18       18              
  Lines        2152     2145       -7     
==========================================
- Hits         1449     1445       -4     
+ Misses        703      700       -3     

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[rubdos]

Thanks!