Bump lombok from 1.18.18 to 1.18.20 in /plugins/maven/example-server (#625)

* Add ability to generate particular types as Java interfaces #606 (#610)

* Gradle 6.8.3.

* Added typesAsInterfaces config option.

* Updated doc.

* Basic implementation for generating type as interface.

* Tests for generating type as interface.

* Code style fixes.

* Code style fixes.

* Java 1.8 build fixes.

* Code style fixes.

* Code style fixes.

* Attempt to fix compilation.

* Code review fixes.

* Revert "Add ability to generate particular types as Java interfaces #606 (#610)" (#613)

This reverts commit 994f6fee.

* Bump lombok from 1.18.18 to 1.18.20 in /plugins/maven/example-server

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)
Signed-off-by: Ndependabot[bot] <support@github.com>
Co-authored-by: NAlexey Zhokhov <alexey@zhokhov.com>
Co-authored-by: NBogdan Kobylynskyi <92bogdan@gmail.com>
Co-authored-by: Ndependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>