fix: bump rand to 0.9.3 for default builds

[tillrohrmann]

Summary by CodeRabbit

• Chores
  • Upgraded the project's random-number generation dependency to v0.9.3.
  • Internal selection method for randomized timeouts was adjusted to use the updated RNG, preserving existing ranges and behavior.
  • No user-visible functionality, behavior, or public API changes.

Closes #585

[ti-chi-bot]

Welcome @tillrohrmann! It looks like this is your first PR to tikv/raft-rs 🎉

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: e7404281-a418-463f-a13e-2e61e2a47e10

📥 Commits

Reviewing files that changed from the base of the PR and between 3e0ef6a and 9351f69.

📒 Files selected for processing (3)

• Cargo.toml
• harness/Cargo.toml
• src/raft.rs

✅ Files skipped from review due to trivial changes (2)

• harness/Cargo.toml
• Cargo.toml

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📝 Walkthrough

Walkthrough

The rand crate was upgraded from 0.8 to 0.9.3 in Cargo.toml and harness/Cargo.toml. src/raft.rs was updated to call rand::rng().random_range(self.min_election_timeout..self.max_election_timeout) instead of rand::thread_rng().gen_range(...).

Changes

Cohort / File(s)	Summary
Dependency files Cargo.toml, harness/Cargo.toml	Bumped rand dependency version from 0.8 to 0.9.3. No other dependency or feature changes.
RNG API usage src/raft.rs	Replaced rand::thread_rng().gen_range(min..max) with rand::rng().random_range(min..max) in reset_randomized_election_timeout to match updated rand API.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped through versions, light and spry,
Swapped a crate, gave RNG a try,
Timeouts now tumble in a fresher way,
Elections jitter with a brighter day,
🎲🥕

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: bumping the rand dependency to version 0.9.3 for default builds, which is exactly what the PR implements.
Linked Issues check	✅ Passed	The PR successfully addresses issue #585 by updating rand from 0.8.5 to 0.9.3 in both Cargo.toml files and updating the related API call in src/raft.rs to use the new rand API.
Out of Scope Changes check	✅ Passed	All changes are directly related to bumping the rand dependency as required by issue #585; no unrelated modifications are present.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[xtqqczze]

Please add "Closes #585" to the PR description.

[tillrohrmann]

Please add "Closes #585" to the PR description.

@xtqqczze done.

[xtqqczze]

Please add "Closes #585" to the PR description.

I meant add to this pull request, not to the commit itself. You'll also need to signoff your commit.

[tillrohrmann]

@xtqqczze thanks for the clarification. Now it should hopefully all be correct :-)

[xtqqczze]

@BusyJay Please could you review

[BusyJay]

Thanks!