chore: update gqlparser to v2

[k1LoW]

This pull request updates the dependency on gqlparser to use the newer v2 API and updates import paths accordingly. This ensures compatibility with the latest features and bug fixes from the gqlparser library.

Dependency update and import path changes:

• Updated the go.mod file to replace github.com/vektah/gqlparser v1.3.1 with github.com/vektah/gqlparser/v2 v2.5.14.
• Updated import statements in tailor/lint.go to use github.com/vektah/gqlparser/v2/ast and github.com/vektah/gqlparser/v2/parser instead of the v1 paths.

[github-actions]

Code Metrics Report

Coverage	Code to Test Ratio
33.5%	1:1.5

Code coverage of files in pull request scope (98.5%)

Files	Coverage
tailor/lint.go	98.5%

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Reported by octocov