Bump jsonpointer and is-my-json-valid

Bumps [jsonpointer](https://github.com/janl/node-jsonpointer) and [is-my-json-valid](https://github.com/mafintosh/is-my-json-valid). These dependencies needed to be updated together.

Updates `jsonpointer` from 4.0.1 to 5.0.1
- [Release notes](https://github.com/janl/node-jsonpointer/releases)
- [Commits](janl/node-jsonpointer@4.0.1...v5.0.1)

Updates `is-my-json-valid` from 2.20.0 to 2.20.6
- [Commits](mafintosh/is-my-json-valid@v2.20.0...v2.20.6)

---
updated-dependencies:
- dependency-name: jsonpointer
  dependency-type: indirect
- dependency-name: is-my-json-valid
  dependency-type: indirect
...

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

Author: dependabot[bot]