Update dependency merge-graphql-schemas to v1.7.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
merge-graphql-schemas	1.7.7 → 1.7.8

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Release Notes

Urigo/merge-graphql-schemas (merge-graphql-schemas)

v1.7.8

Compare Source

• Come talk to us directly on our Discord channel: https://discord.gg/xud7bH9
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• Update graphql-toolkit

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