Add concurrency to ci workflow

[fmoletta]

Adds usage of concurrency to the ci workflow, canceling duplicate runs of this workflow on all branches but main

[github-actions]

Benchmarking results

Benchmark for program factorial_2M

Open benchmarks

Command	Mean [s]	Min [s]	Max [s]	Relative
Cairo-vm (Rust, Cairo 1)	11.416 ± 0.090	11.319	11.614	23.71 ± 0.25
cairo-native (embedded AOT)	1.540 ± 0.015	1.524	1.564	3.20 ± 0.04
cairo-native (embedded JIT using LLVM's ORC Engine)	1.632 ± 0.017	1.611	1.654	3.39 ± 0.04
cairo-native (standalone AOT)	0.652 ± 0.001	0.652	0.654	1.36 ± 0.01
cairo-native (standalone AOT with -march=native)	0.481 ± 0.003	0.480	0.491	1.00

Benchmark for program fib_2M

Open benchmarks

Command	Mean [s]	Min [s]	Max [s]	Relative
Cairo-vm (Rust, Cairo 1)	10.780 ± 0.081	10.633	10.908	1311.51 ± 20.86
cairo-native (embedded AOT)	1.163 ± 0.012	1.141	1.187	141.51 ± 2.49
cairo-native (embedded JIT using LLVM's ORC Engine)	1.179 ± 0.012	1.163	1.201	143.49 ± 2.50
cairo-native (standalone AOT)	0.009 ± 0.000	0.008	0.010	1.04 ± 0.02
cairo-native (standalone AOT with -march=native)	0.008 ± 0.000	0.008	0.009	1.00

Benchmark for program logistic_map

Open benchmarks

Command	Mean [s]	Min [s]	Max [s]	Relative
Cairo-vm (Rust, Cairo 1)	1.973 ± 0.012	1.958	1.996	29.74 ± 0.19
cairo-native (embedded AOT)	1.308 ± 0.013	1.283	1.324	19.72 ± 0.20
cairo-native (embedded JIT using LLVM's ORC Engine)	1.482 ± 0.014	1.460	1.504	22.34 ± 0.22
cairo-native (standalone AOT)	0.107 ± 0.000	0.107	0.108	1.62 ± 0.00
cairo-native (standalone AOT with -march=native)	0.066 ± 0.000	0.066	0.067	1.00

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.95%. Comparing base (5d8ab59) to head (674b826).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #636   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files         109      109           
  Lines       34203    34203           
=======================================
  Hits        31452    31452           
  Misses       2751     2751           

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