Upgrade to version 4 of clap

[jonhoo]

Replaces #266

This increases MSRV to 1.60.0 (because of clap) when the cli feature is enabled.

[djc]

Another reason to adopt 1.60 (or 1.59) might be to get rid of the num_cpus dependency in favor of std::thread::available_parallelism().

[codecov]

Codecov Report

Base: 91.11% // Head: 91.14% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (dab523b) compared to base (044e3ab).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
+ Coverage   91.11%   91.14%   +0.03%     
==========================================
  Files          19       19              
  Lines        4219     4236      +17     
==========================================
+ Hits         3844     3861      +17     
  Misses        375      375              

Impacted Files	Coverage Δ
src/flamegraph/color/mod.rs	87.39% <ø> (ø)
src/flamegraph/mod.rs	98.22% <100.00%> (+0.06%)	⬆️

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[jonhoo]

Yep, good call-out. I'll merge this and then land that and a fix to #278 separately.

[jonhoo]

Done in #279

[jonhoo]

Released in 0.11.15 🎉