Bump diesel from 2.2.8 to 2.2.9 in /scylla-server (#359)

Bumps [diesel](https://github.com/diesel-rs/diesel) from 2.2.8 to 2.2.9.
- [Release notes](https://github.com/diesel-rs/diesel/releases)
- [Changelog](https://github.com/diesel-rs/diesel/blob/v2.2.9/CHANGELOG.md)
- [Commits](diesel-rs/diesel@v2.2.8...v2.2.9)

---
updated-dependencies:
- dependency-name: diesel
  dependency-version: 2.2.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

scylla-server/Cargo.lock

@@ -5,7 +5,7 @@ edition = "2021"
 default-run = "scylla-server"
 
 [dependencies]
-diesel = { version = "2.2.8", features = ["postgres", "chrono"] }
+diesel = { version = "2.2.9", features = ["postgres", "chrono"] }
 dotenvy = "0.15"
 serde = "1.0.219"
 protobuf-codegen = "3.7.1"