Bump pprof from 0.3.18 to 0.3.20

Bumps [pprof](https://github.com/tikv/pprof-rs) from 0.3.18 to 0.3.20.
- [Release notes](https://github.com/tikv/pprof-rs/releases)
- [Commits](https://github.com/tikv/pprof-rs/compare/v0.3.18...v0.3.20)

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

Cargo.lock

@@ -276,28 +276,6 @@ version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
-[[package]]
-name = "failure"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d32e9bd16cc02eae7db7ef620b392808b89f6a5e16bb3497d159c6b92a0f4f86"
-dependencies = [
- "backtrace",
- "failure_derive",
-]
-
-[[package]]
-name = "failure_derive"
-version = "0.1.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "aa4da3c766cd7a0db8242e326e9e4e081edd567072893ed320008189715366a4"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "synstructure",
-]
-
 [[package]]
 name = "form_urlencoded"
 version = "1.0.0"
@@ -610,15 +588,6 @@ dependencies = [
  "winapi",
 ]
 
-[[package]]
-name = "msvc-demangler"
-version = "0.8.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6584cf122f02fc0396420a116cd395a9a776ec4347dffe1c5119c3fcc917c060"
-dependencies = [
- "bitflags",
-]
-
 [[package]]
 name = "nix"
 version = "0.17.0"
@@ -760,9 +729,9 @@ checksum = "3831453b3449ceb48b6d9c7ad7c96d5ea673e9b470a1dc578c2ce6521230884c"
 
 [[package]]
 name = "pprof"
-version = "0.3.18"
+version = "0.3.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "53d27a595ff6b6fb3682cc3cea1940860f8d99f91fb849cff82f0315384c7609"
+checksum = "937e4766a8d473f9dd3eb318c654dec77d6715a87ab50081d6e5cfceea73c105"
 dependencies = [
  "backtrace",
  "inferno",
@@ -1037,12 +1006,11 @@ checksum = "9091b6114800a5f2141aee1d1b9d6ca3592ac062dc5decb3764ec5895a47b4eb"
 
 [[package]]
 name = "symbolic-common"
-version = "7.5.0"
+version = "8.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c97c98b6026c932123a976d0cd35f59256424507e3dec9d032f30828765f1bf2"
+checksum = "0caab39ce6f074031b8fd3dd297bfda70a2d1f33c6e7cc1b737ac401f856448d"
 dependencies = [
  "debugid",
- "failure",
  "memmap",
  "stable_deref_trait",
  "uuid",
@@ -1050,13 +1018,11 @@ dependencies = [
 
 [[package]]
 name = "symbolic-demangle"
-version = "7.5.0"
+version = "8.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f0a995a1a11d6ea7cdcf237618733dd57076439d376a06d136b4f9d097da4acf"
+checksum = "b77ecb5460a87faa37ed53521eed8f073c8339b7a5788c1f93efc09ce74e1b68"
 dependencies = [
- "cc",
  "cpp_demangle",
- "msvc-demangler",
  "rustc-demangle",
  "symbolic-common",
 ]
@@ -1072,18 +1038,6 @@ dependencies = [
  "unicode-xid",
 ]
 
-[[package]]
-name = "synstructure"
-version = "0.12.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b834f2d66f734cb897113e34aaff2f1ab4719ca946f9a7358dba8f8064148701"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
- "unicode-xid",
-]
-
 [[package]]
 name = "tempfile"
 version = "3.1.0"