dependency: bump graphql from 15.6.0 to 15.6.1

Bumps graphql from 15.6.0 to 15.6.1.

Release notes

Sourced from graphql's releases.

v15.6.1 (2021-10-05)

Bug Fix 🐞

• #3275 type/introspection: add missing __Directive.args(includeDeprecated:) (@​IvanGoncharov)

Committers: 1

• Ivan Goncharov(@​IvanGoncharov)

Commits

• dcf3751 15.6.1
• eb0fed0 type/introspection: add missing __Directive.args(includeDeprecated:) (#3275)
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