Bump pprof from 0.3.20 to 0.3.21

Bumps [pprof](https://github.com/tikv/pprof-rs) from 0.3.20 to 0.3.21.
- [Release notes](https://github.com/tikv/pprof-rs/releases)
- [Commits](https://github.com/tikv/pprof-rs/compare/v0.3.20...v0.3.21)

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

Cargo.lock

@@ -590,15 +590,14 @@ dependencies = [
 
 [[package]]
 name = "nix"
-version = "0.17.0"
+version = "0.19.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "50e4785f2c3b7589a0d0c1dd60285e1188adac4006e8abd6dd578e1567027363"
+checksum = "b2ccba0cfe4fdf15982d1674c69b1fd80bad427d293849982668dfe454bd61f2"
 dependencies = [
  "bitflags",
  "cc",
- "cfg-if 0.1.10",
+ "cfg-if 1.0.0",
  "libc",
- "void",
 ]
 
 [[package]]
@@ -729,9 +728,9 @@ checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
 
 [[package]]
 name = "pprof"
-version = "0.3.20"
+version = "0.3.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "937e4766a8d473f9dd3eb318c654dec77d6715a87ab50081d6e5cfceea73c105"
+checksum = "8279bcc9c673a16a105ac0c9d2de161d2fb1344c22abb6b06614a7d291b5ea58"
 dependencies = [
  "backtrace",
  "inferno",
@@ -1197,12 +1196,6 @@ version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
-[[package]]
-name = "void"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
-
 [[package]]
 name = "wasi"
 version = "0.9.0+wasi-snapshot-preview1"