chore(deps): bump the shuttle group in /examples with 2 updates (#623)

Bumps the shuttle group in /examples with 2 updates: [shuttle-actix-web](https://github.com/shuttle-hq/shuttle) and [shuttle-runtime](https://github.com/shuttle-hq/shuttle).


Updates `shuttle-actix-web` from 0.55.0 to 0.56.0
- [Release notes](https://github.com/shuttle-hq/shuttle/releases)
- [Changelog](https://github.com/shuttle-hq/shuttle/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shuttle-hq/shuttle/compare/v0.55.0...v0.56.0)

Updates `shuttle-runtime` from 0.55.0 to 0.56.0
- [Release notes](https://github.com/shuttle-hq/shuttle/releases)
- [Changelog](https://github.com/shuttle-hq/shuttle/blob/main/CHANGELOG.md)
- [Commits](https://github.com/shuttle-hq/shuttle/compare/v0.55.0...v0.56.0)

---
updated-dependencies:
- dependency-name: shuttle-actix-web
  dependency-version: 0.56.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: shuttle
- dependency-name: shuttle-runtime
  dependency-version: 0.56.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: shuttle
...

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

examples/shuttle/Cargo.toml

@@ -7,7 +7,7 @@ edition.workspace = true
 # <shuttle-deps>
 [dependencies]
 actix-web = "4"
-shuttle-actix-web = "0.55"
-shuttle-runtime = "0.55"
+shuttle-actix-web = "0.56"
+shuttle-runtime = "0.56"
 tokio = "1"
 # </shuttle-deps>