Bump lombok from 1.18.18 to 1.18.20

Bumps [lombok](https://github.com/rzwitserloot/lombok) from 1.18.18 to 1.18.20.
- [Release notes](https://github.com/rzwitserloot/lombok/releases)
- [Changelog](https://github.com/rzwitserloot/lombok/blob/master/doc/changelog.markdown)
- [Commits](https://github.com/rzwitserloot/lombok/compare/v1.18.18...v1.18.20

)

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