build(deps): bump diesel from 2.3.6 to 2.3.8

Bumps [diesel](https://github.com/diesel-rs/diesel) from 2.3.6 to 2.3.8.
- [Release notes](https://github.com/diesel-rs/diesel/releases)
- [Changelog](https://github.com/diesel-rs/diesel/blob/main/CHANGELOG.md)
- [Commits](diesel-rs/diesel@v2.3.6...v2.3.8)

---
updated-dependencies:
- dependency-name: diesel
  dependency-version: 2.3.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

Cargo.lock

@@ -31,7 +31,7 @@ askama = "0.12"
 base64 = "0.22"
 bytes = "1"
 chrono = { version = "0.4", features = ["serde"] }
-diesel = { version = "2.0", features = ["postgres", "chrono", "serde_json", "r2d2"] }
+diesel = { version = "2.3", features = ["postgres", "chrono", "serde_json", "r2d2"] }
 diesel_migrations = { version = "2.0" }
 dotenv = "0.15"
 filetime = "0.2"