chore: bump etcd-client from 0.7.2 to 0.8.1 (#21513)

Bumps [etcd-client](https://github.com/etcdv3/etcd-client) from 0.7.2 to 0.8.1.
- [Release notes](https://github.com/etcdv3/etcd-client/releases)
- [Commits](https://github.com/etcdv3/etcd-client/compare/0.7.2...0.8.1)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

core/Cargo.toml

@@ -21,7 +21,7 @@ bs58 = "0.4.0"
 chrono = { version = "0.4.11", features = ["serde"] }
 crossbeam-channel = "0.5"
 dashmap = { version = "4.0.2", features = ["rayon", "raw-api"] }
-etcd-client = { version = "0.7.2", features = ["tls"]}
+etcd-client = { version = "0.8.1", features = ["tls"]}
 fs_extra = "1.2.0"
 histogram = "0.6.9"
 itertools = "0.10.1"