Bump libc from 0.2.119 to 0.2.121 (paritytech#11127)

Bumps [libc](https://github.com/rust-lang/libc) from 0.2.119 to 0.2.121.
- [Release notes](https://github.com/rust-lang/libc/releases)
- [Commits](rust-lang/libc@0.2.119...0.2.121)

---
updated-dependencies:
- dependency-name: libc
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

client/executor/wasmtime/Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 targets = ["x86_64-unknown-linux-gnu"]
 
 [dependencies]
-libc = "0.2.119"
+libc = "0.2.121"
 cfg-if = "1.0"
 log = "0.4.8"
 parity-wasm = "0.42.0"

client/tracing/Cargo.toml

@@ -17,7 +17,7 @@ ansi_term = "0.12.1"
 atty = "0.2.13"
 chrono = "0.4.19"
 lazy_static = "1.4.0"
-libc = "0.2.119"
+libc = "0.2.121"
 log = { version = "0.4.8" }
 once_cell = "1.8.0"
 parking_lot = "0.12.0"