Bump pdfjs-dist and @compodoc/compodoc in /core (#218)

Removes [pdfjs-dist](https://github.com/mozilla/pdfjs-dist). It's no longer used after updating ancestor dependency [@compodoc/compodoc](https://github.com/compodoc/compodoc). These dependencies need to be updated together.


Removes `pdfjs-dist`

Updates `@compodoc/compodoc` from 1.1.23 to 1.1.25
- [Release notes](https://github.com/compodoc/compodoc/releases)
- [Changelog](https://github.com/compodoc/compodoc/blob/develop/CHANGELOG.md)
- [Commits](compodoc/compodoc@1.1.23...1.1.25)

---
updated-dependencies:
- dependency-name: pdfjs-dist
  dependency-type: indirect
- dependency-name: "@compodoc/compodoc"
  dependency-type: direct:development
...

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Author: dependabot[bot]