Update graphql-tools monorepo to v6.0.12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@graphql-tools/merge	devDependencies	patch	6.0.11 -> 6.0.12
@graphql-tools/schema	devDependencies	patch	6.0.11 -> 6.0.12

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Release Notes

ardatan/graphql-tools

v6.0.12

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What’s Changed

🐛 Bug Fixes

• fix(loadSchema): add optional chaining @​jameslahm (#​1696)
• Use DocumentNode instead of GraphQLResolveInfo to decide the HTTP method for useGETForQueries @​ardatan (#​1716)
• Name operations @​yaacovCR (#​1700)
• Fixes for complex type merging @​yaacovCR (#​1699)

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