Fix coverage testing on the CI

[kchibisov]

The way coverage is enabled/disabled was changed upstream.

Links: rust-lang/rust#114656

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (1c2fd23) 86.82% compared to head (a3501cf) 86.82%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #150   +/-   ##
=======================================
  Coverage   86.82%   86.82%           
=======================================
  Files          14       14           
  Lines        1806     1806           
=======================================
  Hits         1568     1568           
  Misses        238      238           

Flag	Coverage Δ
macos-latest	85.86% <ø> (ø)
ubuntu-latest	86.35% <ø> (ø)

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Files Changed	Coverage Δ
src/error.rs	0.00% <ø> (ø)
src/io.rs	73.93% <ø> (ø)
src/loop_logic.rs	86.90% <ø> (ø)
src/sources/channel.rs	77.14% <ø> (ø)
src/sources/mod.rs	95.18% <ø> (ø)
src/sources/timer.rs	86.53% <ø> (ø)
src/sys.rs	98.49% <ø> (ø)

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[kchibisov]

First time I see coverage test pass on my PR, impressive.

[elinorbgr]

Thanks!