Bump nix from 0.23.1 to 0.24.1

Bumps [nix](https://github.com/nix-rust/nix) from 0.23.1 to 0.24.1.
- [Release notes](https://github.com/nix-rust/nix/releases)
- [Changelog](https://github.com/nix-rust/nix/blob/master/CHANGELOG.md)
- [Commits](https://github.com/nix-rust/nix/compare/v0.23.1...v0.24.1)

---
updated-dependencies:
- dependency-name: nix
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

polkadot/Cargo.lock

@@ -4880,6 +4880,18 @@ dependencies = [
  "memoffset",
 ]
 
+[[package]]
+name = "nix"
+version = "0.24.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f17df307904acd05aa8e32e97bb20f2a0df1728bbc2d771ae8f9a90463441e9"
+dependencies = [
+ "bitflags",
+ "cfg-if 1.0.0",
+ "libc",
+ "memoffset",
+]
+
 [[package]]
 name = "nodrop"
 version = "0.1.14"
@@ -6392,7 +6404,7 @@ version = "0.9.19"
 dependencies = [
  "assert_cmd",
  "color-eyre",
- "nix 0.23.1",
+ "nix 0.24.1",
  "parity-util-mem",
  "polkadot-cli",
  "polkadot-core-primitives",
@@ -7064,7 +7076,7 @@ dependencies = [
  "hyper",
  "log",
  "metered-channel",
- "nix 0.23.1",
+ "nix 0.24.1",
  "parity-scale-codec",
  "polkadot-primitives",
  "polkadot-test-service",

polkadot/Cargo.toml

@@ -19,7 +19,7 @@ parity-util-mem = { version = "0.11.0", default-features = false, features = ["j
 
 [dev-dependencies]
 assert_cmd = "2.0.4"
-nix = "0.23.1"
+nix = "0.24.1"
 tempfile = "3.2.0"
 tokio = "1.18.1"
 remote-externalities = { git = "https://github.com/paritytech/substrate", branch = "master" }

polkadot/node/metrics/Cargo.toml

@@ -25,7 +25,7 @@ log = "0.4.16"
 
 [dev-dependencies]
 assert_cmd = "2.0.4"
-nix = "0.23.1"
+nix = "0.24.1"
 tempfile = "3.2.0"
 hyper = { version = "0.14.18", default-features = false, features = ["http1", "tcp"] }
 tokio = "1.18.1"