Bump tokio from 1.7.1 to 1.8.0

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.7.1 to 1.8.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.7.1...tokio-1.8.0)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Cargo.lock

@@ -4174,9 +4174,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.7.1"
+version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5fb2ed024293bb19f7a5dc54fe83bf86532a44c12a2bb8ba40d64a4509395ca2"
+checksum = "570c2eb13b3ab38208130eccd41be92520388791207fde783bda7c1e8ace28d4"
 dependencies = [
  "autocfg 1.0.1",
  "bytes 1.0.1",