chore(deps): update rust crate rand_chacha to 0.3.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
rand_chacha (source)	dependencies	minor	0.2.2 -> 0.3.1

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Release Notes

rust-random/rand

v0.3.1

Compare Source

Changed

• Require log <= 0.3.8 for dev builds
• Update fuchsia-zircon dependency to 0.3
• Fix broken links in docs (to unblock compiler docs testing CI)

v0.3.0

Compare Source

Changed

• Update to use log version 0.3.x

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[monoid]

Is not compatible with ed25519-dalek = "1.0.1".

[renovate]

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