feat(ci): make rust version in ci configurable

[nimrod-starkware]

This change is 

[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [65.692 ms 65.811 ms 65.975 ms]
change: [-8.0871% -4.3987% -1.3239%] (p = 0.01 < 0.05)
Performance has improved.
Found 3 outliers among 100 measurements (3.00%)
2 (2.00%) high mild
1 (1.00%) high severe

[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [65.554 ms 65.627 ms 65.713 ms]
change: [-9.7893% -6.1572% -2.9326%] (p = 0.00 < 0.05)
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
3 (3.00%) high mild
2 (2.00%) high severe

[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [65.816 ms 65.908 ms 66.034 ms]
change: [-7.7279% -4.3453% -1.5351%] (p = 0.00 < 0.05)
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
3 (3.00%) high mild
2 (2.00%) high severe

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.71%. Comparing base (09cd2b3) to head (9c48e48).
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #349      +/-   ##
==========================================
- Coverage   76.73%   76.71%   -0.03%     
==========================================
  Files         318      319       +1     
  Lines       34569    34642      +73     
  Branches    34569    34642      +73     
==========================================
+ Hits        26527    26576      +49     
- Misses       5755     5777      +22     
- Partials     2287     2289       +2     

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[github-actions]

Benchmark movements:
tree_computation_flow performance improved 😺
tree_computation_flow time: [65.360 ms 65.438 ms 65.522 ms]
change: [-4.3748% -3.3761% -2.4455%] (p = 0.00 < 0.05)
Performance has improved.
Found 5 outliers among 100 measurements (5.00%)
1 (1.00%) low severe
2 (2.00%) high mild
2 (2.00%) high severe