chore(deps): bump graphql from 14.5.5 to 15.5.1

Bumps [graphql](https://github.com/graphql/graphql-js) from 14.5.5 to 15.5.1.
- [Release notes](https://github.com/graphql/graphql-js/releases)
- [Commits](graphql/graphql-js@v14.5.5...v15.5.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]