Bump rand from 0.6.5 to 0.8.4

Bumps [rand](https://github.com/rust-random/rand) from 0.6.5 to 0.8.4.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@0.6.5...0.8.4)

---
updated-dependencies:
- dependency-name: rand
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

cfd_protocol/Cargo.toml

@@ -7,7 +7,7 @@ edition = "2018"
 anyhow = "1"
 bdk = { git = "https://github.com/bitcoindevkit/bdk/" }
 itertools = "0.10"
-rand = "0.6"
+rand = "0.8"
 rand_chacha = "0.1"
 secp256k1-zkp = { version = "0.4", features = ["hashes", "global-context"] }
 

daemon/Cargo.toml

@@ -10,7 +10,7 @@ cfd_protocol = { path = "../cfd_protocol" }
 clap = "3.0.0-beta.4"
 futures = { version = "0.3", default-features = false }
 hkdf = "0.11"
-rand = "0.6"
+rand = "0.8"
 rocket = { git = "https://github.com/SergioBenitez/Rocket", features = ["json"] }
 rocket_db_pools = { git = "https://github.com/SergioBenitez/Rocket", features = ["sqlx_sqlite"] }
 rust_decimal = { version = "1.15", features = ["serde-float", "serde-arbitrary-precision"] }