Bump tokio-stream from 0.1.7 to 0.1.8 in /src/agent (#1417)

Bumps [tokio-stream](https://github.com/tokio-rs/tokio) from 0.1.7 to 0.1.8.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-stream-0.1.7...tokio-stream-0.1.8)

---
updated-dependencies:
- dependency-name: tokio-stream
  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>
Co-authored-by: Marc Greisen <marc@greisen.org>

src/agent/Cargo.lock

@@ -2804,9 +2804,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-stream"
-version = "0.1.7"
+version = "0.1.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b2f3f698253f03119ac0102beaa64f67a67e08074d03a22d18784104543727f"
+checksum = "50145484efff8818b5ccd256697f36863f587da82cf8b409c53adf1e840798e3"
 dependencies = [
  "futures-core",
  "pin-project-lite",