Bump rand from 0.8.1 to 0.8.2 (#2266)

Bumps [rand](https://github.com/rust-random/rand) from 0.8.1 to 0.8.2.
- [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/0.8.1...0.8.2)

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

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

polkadot/Cargo.lock

@@ -1444,7 +1444,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "cfcf0ed7fe52a17a03854ec54a9f76d6d84508d1c0e66bc1793301c73fc8493c"
 dependencies = [
  "byteorder",
- "rand 0.8.1",
+ "rand 0.8.2",
  "rustc-hex",
  "static_assertions",
 ]
@@ -5614,7 +5614,7 @@ dependencies = [
  "pallet-vesting",
  "parity-scale-codec",
  "polkadot-primitives",
- "rand 0.8.1",
+ "rand 0.8.2",
  "rand_chacha 0.3.0",
  "rustc-hex",
  "sc-keystore",
@@ -5855,7 +5855,7 @@ dependencies = [
  "polkadot-runtime-parachains",
  "polkadot-service",
  "polkadot-test-runtime",
- "rand 0.8.1",
+ "rand 0.8.2",
  "sc-authority-discovery",
  "sc-chain-spec",
  "sc-cli",
@@ -6228,9 +6228,9 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.8.1"
+version = "0.8.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c24fcd450d3fa2b592732565aa4f17a27a61c65ece4726353e000939b0edee34"
+checksum = "18519b42a40024d661e1714153e9ad0c3de27cd495760ceb09710920f1098b1e"
 dependencies = [
  "libc",
  "rand_chacha 0.3.0",
@@ -9033,7 +9033,7 @@ checksum = "dac1c663cfc93810f88aed9b8941d48cabf856a1b111c29a40439018d870eb22"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
- "rand 0.8.1",
+ "rand 0.8.2",
  "redox_syscall 0.2.4",
  "remove_dir_all",
  "winapi 0.3.9",