Bump nextra from 3.2.4 to 4.2.16

Bumps [nextra](https://github.com/shuding/nextra) from 3.2.4 to 4.2.16.
- [Release notes](https://github.com/shuding/nextra/releases)
- [Commits](https://github.com/shuding/nextra/compare/[email protected]@4.2.16)

---
updated-dependencies:
- dependency-name: nextra
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]