build(deps): bump rand_chacha from 0.3.0 to 0.3.1

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>

Cargo.lock

@@ -2632,7 +2632,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c24fcd450d3fa2b592732565aa4f17a27a61c65ece4726353e000939b0edee34"
 dependencies = [
  "libc",
- "rand_chacha 0.3.0",
+ "rand_chacha 0.3.1",
  "rand_core 0.6.2",
  "rand_hc 0.3.0",
 ]
@@ -2649,9 +2649,9 @@ 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 0.6.2",
@@ -4439,7 +4439,7 @@ dependencies = [
  "proptest",
  "proptest-derive",
  "rand 0.8.1",
- "rand_chacha 0.3.0",
+ "rand_chacha 0.3.1",
  "rand_core 0.6.2",
  "redjubjub",
  "ripemd160",