Bump graphql from 15.5.1 to 16.6.0

Bumps [graphql](https://github.com/graphql/graphql-js) from 15.5.1 to 16.6.0.
- [Release notes](https://github.com/graphql/graphql-js/releases)
- [Commits](graphql/graphql-js@v15.5.1...v16.6.0)

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

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

Author: dependabot[bot]