build(deps): update smallvec requirement from 0.6.10 to 1.6.0 (#494)

Updates the requirements on [smallvec](https://github.com/servo/rust-smallvec) to permit the latest version.
- [Release notes](https://github.com/servo/rust-smallvec/releases)
- [Commits](https://github.com/servo/rust-smallvec/commits/v1.6.0)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Andronik Ordian <write@reusable.software>

transaction-pool/Cargo.toml

@@ -9,7 +9,7 @@ edition = "2018"
 
 [dependencies]
 log = "0.4.8"
-smallvec = "0.6.10"
+smallvec = "1.6.0"
 trace-time = { path = "../trace-time", version = "0.1" }
 
 [dev-dependencies]