chore: rand_chacha is not needed

[vil02]

Pull Request Template

Description

This PR removes rand_chacha from the dependencies as it is not needed.

Related to:

• chore(deps): update rand_chacha requirement from 0.3 to 0.9 #863

Checklist:

• I ran bellow commands using the latest version of rust nightly.
• I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• I ran cargo fmt just before my last commit.
• I ran cargo test just before my last commit and all tests passed.
• I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• I added my algorithm to DIRECTORY.md with the correct link.
• I checked COUNTRIBUTING.md and my code follows its guidelines.

Please make sure that if there is a test that takes too long to run ( > 300ms), you #[ignore] that or
try to optimize your code or make the test easier to run. We have this rule because we have hundreds of
tests to run; If each one of them took 300ms, we would have to wait for a long time.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.49%. Comparing base (c162aa9) to head (4e542bb).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #866   +/-   ##
=======================================
  Coverage   95.49%   95.49%           
=======================================
  Files         316      316           
  Lines       22922    22922           
=======================================
  Hits        21889    21889           
  Misses       1033     1033           

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[vil02]

@siriak: the CI needs #865. I will mark it as ready for review, but please rebase it before merging.