Update rand_core to 0.10.0-rc-4

[dhardy]

• Added a CHANGELOG.md entry

Summary

Update regarding these rand_core PRs:

• Revise index / reset / skip methods rand_core#44
• Let RngCore: TryRngCore<Error = Infallible> rand_core#45

Unresolved

chacha20

rand_chacha test failure (likely due to rust-random/rand_core#44)

[Fethbita]

0.10.0-rc-5 (see rust-random/rand_core#51) is published, maybe better to update to that?

[dhardy]

RC5 has no breaking changes over this.

[baloo]

Tested in a couple of downstream crates. No issues found

[tarcieri]

Hmm, shouldn't both the rand_core and chacha20 dependencies be bumped?

[dhardy]

@tarcieri dependabot has done this: #1713.

I don't think we need to bump the numbers in Cargo.toml since we opted to allow this type of update.

[tarcieri]

Yeah they should all be compatible, just noting you merged old version numbers

[dhardy]

Yes, I saw no need to update; the code should be compatible with both versions (on your advice not to pin the version).

[baloo]

Any chance to get another release candidate of rand?

Would ease things up for consumers.