chore(deps): bump the cargo group with 3 updates

Bumps the cargo group with 3 updates: [diesel](https://github.com/diesel-rs/diesel), [h2](https://github.com/hyperium/h2) and [mio](https://github.com/tokio-rs/mio).


Updates `diesel` from 2.1.0 to 2.1.6
- [Release notes](https://github.com/diesel-rs/diesel/releases)
- [Changelog](https://github.com/diesel-rs/diesel/blob/master/CHANGELOG.md)
- [Commits](diesel-rs/diesel@v2.1.0...v2.1.6)

Updates `h2` from 0.3.19 to 0.3.26
- [Release notes](https://github.com/hyperium/h2/releases)
- [Changelog](https://github.com/hyperium/h2/blob/v0.3.26/CHANGELOG.md)
- [Commits](hyperium/h2@v0.3.19...v0.3.26)

Updates `mio` from 0.8.8 to 0.8.11
- [Release notes](https://github.com/tokio-rs/mio/releases)
- [Changelog](https://github.com/tokio-rs/mio/blob/master/CHANGELOG.md)
- [Commits](tokio-rs/mio@v0.8.8...v0.8.11)

---
updated-dependencies:
- dependency-name: diesel
  dependency-type: direct:production
  dependency-group: cargo
- dependency-name: h2
  dependency-type: indirect
  dependency-group: cargo
- dependency-name: mio
  dependency-type: indirect
  dependency-group: cargo
...

Signed-off-by: dependabot[bot] <[email protected]>

Cargo.toml

@@ -8,7 +8,7 @@ edition = "2021"
 [dependencies]
 actix-files = "0.6.2"
 actix-web = "4.2.1"
-diesel = { version = "2.0.2", features = ["postgres", "r2d2"] }
+diesel = { version = "2.1.6", features = ["postgres", "r2d2"] }
 diesel_migrations = "2.0.0"
 dotenvy = "0.15.6"
 env_logger = "0.10.0"