Bump fork from 0.1.20 to 0.1.21

Bumps [fork](https://github.com/immortal/fork) from 0.1.20 to 0.1.21.
- [Commits](https://github.com/immortal/fork/compare/0.1.20...0.1.21)

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

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

Cargo.lock

@@ -376,9 +376,9 @@ checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
 
 [[package]]
 name = "fork"
-version = "0.1.20"
+version = "0.1.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9788ce090af4bf8d6e8f43d3f7d12305c787456387bd2d88856fcda3aa1f0dca"
+checksum = "eaf4b001d25ec51f755157ecffa208b342747ea9a4365df5438b12925c7f0056"
 dependencies = [
  "libc",
 ]
@@ -669,9 +669,9 @@ checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
 
 [[package]]
 name = "libc"
-version = "0.2.139"
+version = "0.2.144"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
+checksum = "2b00cc1c228a6782d0f076e7b232802e0c5689d41bb5df366f2a6b6621cfdfe1"
 
 [[package]]
 name = "linux-raw-sys"