fix(deps): update dependency mercurius to v7.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
mercurius (source)	7.4.0 -> 7.9.1

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Release Notes

mercurius-js/mercurius

v7.9.1

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📚 PR:

• fix: change context merging behavior (#​515)

v7.9.0

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📚 PR:

• Subscription loaders (#​513)

v7.8.0

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📚 PR:

• build(deps-dev): bump tsd from 0.16.0 to 0.17.0 (#​505)
• fix: allow scalar subscriptions (#​508)
• refactor(gateway): defineResolvers now properly handles value types (#​507)
• feat(gateway): add support for nested value types (#​510)

v7.7.0

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📚 PR:

• feat(gateway): add rewriteConnectionInitPayload option (#​483)
• Prevent query caching with validationRules function (#​485)
• build(deps): bump actions/checkout from 2 to 2.3.4 (#​486)
• build(deps-dev): bump tsd from 0.14.0 to 0.15.1 (#​487)
• Improve test stability (#​491)
• build(deps): bump fastify/github-action-merge-dependabot (#​498)
• build(deps): bump fastify/github-action-merge-dependabot (#​500)
• build(deps-dev): bump tsd from 0.15.1 to 0.16.0 (#​501)
• feat(gateway): handle value types (#​502)

v7.6.1

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📚 PR:

• fix mergeInfo type conflict (#​472)
• Add Mercurius auth plugin documentation links (#​475)
• fix(types): add context to rewrite headers (#​480)

v7.6.0

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📚 PR:

• fix #​467 (#​468)
• build(deps-dev): bump @​types/node from 14.14.42 to 15.0.0 (#​469)
• feat: @​requires directive on different services as gateway (#​470)

v7.5.0

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📚 PR:

• Add support for Mercurius auth plugin (#​461)
• Produce a friendly error message in case of a missing @​key (#​462)
• add Node v16 to CI (#​464)

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