Bump mercurius from 14.1.0 to 15.0.0 (#434)

Bumps [mercurius](https://github.com/mercurius-js/mercurius) from 14.1.0 to 15.0.0.
- [Release notes](https://github.com/mercurius-js/mercurius/releases)
- [Commits](mercurius-js/mercurius@v14.1.0...v15.0.0)

---
updated-dependencies:
- dependency-name: mercurius
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>