Update io-lifetimes requirement from 0.6 to 0.7

Updates the requirements on [io-lifetimes](https://github.com/sunfishcode/io-lifetimes) to permit the latest version.
- [Release notes](https://github.com/sunfishcode/io-lifetimes/releases)
- [Commits](sunfishcode/io-lifetimes@v0.6.0...v0.7.0)

---
updated-dependencies:
- dependency-name: io-lifetimes
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.toml

@@ -44,7 +44,7 @@ tokio = { version = "1", features = [ "process", "io-util", "macros" ] }
 tokio-pipe = "0.2.8"
 
 libc = "0.2.112"
-io-lifetimes = "0.6"
+io-lifetimes = "0.7"
 
 once_cell = "1.8.0"
 dirs = "4.0.0"