Bump prismjs and spec-up

Bumps [prismjs](https://github.com/PrismJS/prism) to 1.29.0 and updates ancestor dependency [spec-up](https://github.com/decentralized-identity/spec-up). These dependencies need to be updated together.


Updates `prismjs` from 1.21.0 to 1.29.0
- [Release notes](https://github.com/PrismJS/prism/releases)
- [Changelog](https://github.com/PrismJS/prism/blob/master/CHANGELOG.md)
- [Commits](PrismJS/prism@v1.21.0...v1.29.0)

Updates `spec-up` from 0.10.1 to 0.10.6
- [Commits](https://github.com/decentralized-identity/spec-up/commits)

---
updated-dependencies:
- dependency-name: prismjs
  dependency-type: indirect
- dependency-name: spec-up
  dependency-type: direct:production
...

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