Bump rand from 0.8.0 to 0.8.1

Bumps [rand](https://github.com/rust-random/rand) from 0.8.0 to 0.8.1.
- [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/0.8.0...0.8.1)

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

Cargo.lock

@@ -215,7 +215,7 @@ checksum = "4c4e7ee8b51e541486d7040883fe1f00e2a9954bcc24fd155b7e4f03ed4b93dd"
 dependencies = [
  "attohttpc",
  "log",
- "rand 0.8.0",
+ "rand 0.8.1",
  "url",
  "xmltree",
 ]
@@ -384,9 +384,9 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.8.0"
+version = "0.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a76330fb486679b4ace3670f117bbc9e16204005c4bde9c4bd372f45bed34f12"
+checksum = "c24fcd450d3fa2b592732565aa4f17a27a61c65ece4726353e000939b0edee34"
 dependencies = [
  "libc",
  "rand_chacha 0.3.0",
@@ -856,7 +856,7 @@ dependencies = [
  "libc",
  "log",
  "privdrop",
- "rand 0.8.0",
+ "rand 0.8.1",
  "ring",
  "serde",
  "serde_derive",