chore(deps): bump github.com/vektah/gqlparser/v2 from 2.5.11 to 2.5.15 in /scanner/keppel in the go_modules group across 1 directory

chore(deps): bump github.com/vektah/gqlparser/v2 from 2.5.11 to 2.5.15 in /scanner/keppel in the go_modules group across 1 directory #124