Swift: Bump github.com/vapor/vapor in the swift-dependencies group

Bumps the swift-dependencies group with 1 update: [github.com/vapor/vapor](https://github.com/vapor/vapor).


Updates `github.com/vapor/vapor` from 4.103.1 to 4.104.0
- [Release notes](https://github.com/vapor/vapor/releases)
- [Commits](vapor/vapor@4.103.1...4.104.0)

---
updated-dependencies:
- dependency-name: github.com/vapor/vapor
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: swift-dependencies
...

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

Author: dependabot[bot]