build(deps): bump rand_core from 0.5.1 to 0.6.1 (#214)

Bumps [rand_core](https://github.com/rust-random/rand) from 0.5.1 to 0.6.1.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](rust-random/rand@rand_core-0.5.1...rand_core-0.6.1)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Cargo.lock

@@ -19,7 +19,7 @@ edition = "2018"
 [dependencies]
 cfg-if = "1"
 cipher = { version = "=0.3.0-pre.4", optional = true }
-rand_core = { version = "0.5", optional = true, default-features = false }
+rand_core = { version = "0.6", optional = true, default-features = false }
 zeroize = { version = "1", optional = true, default-features = false }
 
 [target.'cfg(any(target_arch = "x86_64", target_arch = "x86"))'.dependencies]