Bump single-source from 0.2.0 to 0.3.0

Bumps [single-source](https://github.com/rabbit72/single-source) from 0.2.0 to 0.3.0.
- [Release notes](https://github.com/rabbit72/single-source/releases)
- [Commits](rabbit72/single-source@v0.2.0...v0.3.0)

---
updated-dependencies:
- dependency-name: single-source
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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