chore: Bump github.com/open-feature/swift-sdk from 0.3.0 to 0.3.1

Bumps [github.com/open-feature/swift-sdk](https://github.com/open-feature/swift-sdk) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/open-feature/swift-sdk/releases)
- [Commits](open-feature/swift-sdk@0.3.0...0.3.1)

---
updated-dependencies:
- dependency-name: github.com/open-feature/swift-sdk
  dependency-version: 0.3.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]