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/apple/swift-http-types](https://github.com/apple/swift-http-types).


Updates `github.com/swiftpackageindex/spimanifest` from 1.7.0 to 1.8.0
- [Release notes](https://github.com/SwiftPackageIndex/SPIManifest/releases)
- [Commits](SwiftPackageIndex/SPIManifest@1.7.0...1.8.0)

Updates `github.com/apple/swift-http-types` from 1.3.1 to 1.4.0
- [Release notes](https://github.com/apple/swift-http-types/releases)
- [Commits](apple/swift-http-types@1.3.1...1.4.0)

---
updated-dependencies:
- dependency-name: github.com/swiftpackageindex/spimanifest
  dependency-version: 1.8.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: swift-dependencies
- dependency-name: github.com/apple/swift-http-types
  dependency-version: 1.4.0
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: swift-dependencies
...

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

Author: dependabot[bot]