build(deps): bump config from 0.15.0 to 0.15.3

Bumps [config](https://github.com/rust-cli/config-rs) from 0.15.0 to 0.15.3.
- [Changelog](https://github.com/rust-cli/config-rs/blob/main/CHANGELOG.md)
- [Commits](rust-cli/config-rs@v0.15.0...v0.15.3)

---
updated-dependencies:
- dependency-name: config
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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