Bump github.com/vektah/gqlparser/v2 from 2.5.10 to 2.5.15

Bumps [github.com/vektah/gqlparser/v2](https://github.com/vektah/gqlparser) from 2.5.10 to 2.5.15.
- [Release notes](https://github.com/vektah/gqlparser/releases)
- [Commits](vektah/gqlparser@v2.5.10...v2.5.15)

---
updated-dependencies:
- dependency-name: github.com/vektah/gqlparser/v2
  dependency-type: indirect
...

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