Bump graphql-ws from 5.14.3 to 5.15.0

Bumps [graphql-ws](https://github.com/enisdenjo/graphql-ws) from 5.14.3 to 5.15.0.
- [Release notes](https://github.com/enisdenjo/graphql-ws/releases)
- [Changelog](https://github.com/enisdenjo/graphql-ws/blob/master/CHANGELOG.md)
- [Commits](enisdenjo/graphql-ws@v5.14.3...v5.15.0)

---
updated-dependencies:
- dependency-name: graphql-ws
  dependency-type: indirect
  update-type: version-update:semver-minor
...

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