Bump rand_chacha from 0.3.0 to 0.3.1 (#3225)

Bumps [rand_chacha](https://github.com/rust-random/rand) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/rust-random/rand/releases)
- [Changelog](https://github.com/rust-random/rand/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rust-random/rand/compare/rand_chacha-0.3.0...rand_chacha-0.3.1)

---
updated-dependencies:
- dependency-name: rand_chacha
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

polkadot/Cargo.lock

@@ -5913,7 +5913,7 @@ dependencies = [
  "polkadot-node-subsystem-util",
  "polkadot-primitives",
  "rand 0.8.4",
- "rand_chacha 0.3.0",
+ "rand_chacha 0.3.1",
  "sc-keystore",
  "sp-application-crypto",
  "sp-consensus-babe",
@@ -6677,7 +6677,7 @@ dependencies = [
  "parity-scale-codec",
  "polkadot-primitives",
  "rand 0.8.4",
- "rand_chacha 0.3.0",
+ "rand_chacha 0.3.1",
  "rustc-hex",
  "sc-keystore",
  "serde",
@@ -7317,7 +7317,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
 dependencies = [
  "libc",
- "rand_chacha 0.3.0",
+ "rand_chacha 0.3.1",
  "rand_core 0.6.1",
  "rand_hc 0.3.0",
 ]
@@ -7334,9 +7334,9 @@ dependencies = [
 
 [[package]]
 name = "rand_chacha"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e12735cf05c9e10bf21534da50a147b924d555dc7a547c42e6bb2d5b6017ae0d"
+checksum = "e6c10a63a0fa32252be49d21e7709d4d4baf8d231c2dbce1eaa8141b9b127d88"
 dependencies = [
  "ppv-lite86",
  "rand_core 0.6.1",