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 

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[vil02]

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