Swift: Bump the swift-dependencies group with 2 updates

Bumps the swift-dependencies group with 2 updates: [github.com/swiftpackageindex/spimanifest](https://github.com/SwiftPackageIndex/SPIManifest) and [github.com/vapor/fluent-kit](https://github.com/vapor/fluent-kit).

Updates `github.com/swiftpackageindex/spimanifest` from 1.11.0 to 1.12.0
- [Release notes](https://github.com/SwiftPackageIndex/SPIManifest/releases)
- [Commits](SwiftPackageIndex/SPIManifest@1.11.0...1.12.0)

Updates `github.com/vapor/fluent-kit` from 1.55.0 to 1.56.0
- [Release notes](https://github.com/vapor/fluent-kit/releases)
- [Commits](vapor/fluent-kit@1.55.0...1.56.0)

---
updated-dependencies:
- dependency-name: github.com/swiftpackageindex/spimanifest
  dependency-version: 1.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: swift-dependencies
- dependency-name: github.com/vapor/fluent-kit
  dependency-version: 1.56.0
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: swift-dependencies
...

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Author: dependabot[bot]