ci: use -Cinstrument-coverage instead of -Zprofile

[cakebaker]

This PR uses -Cinstrument-coverage instead of -Zprofile because support for -Zprofile has been removed from Rust nightly: rust-lang/rust#131829

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (3b7e6e7) to head (f06d542).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #9       +/-   ##
=======================================
- Coverage   77.35%    0   -77.36%     
=======================================
  Files           1    0        -1     
  Lines          53    0       -53     
  Branches        9    0        -9     
=======================================
- Hits           41    0       -41     
+ Misses         12    0       -12     

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