Bump graphql-tools from 2.18.0 to 2.23.1

[dependabot-preview]

Bumps graphql-tools from 2.18.0 to 2.23.1.

Changelog

Sourced from graphql-tools's changelog.

Change log

vNEXT

v2.23.0

• The SchemaDirectiveVisitor abstraction for implementing reusable schema [**directive**](https://github.com/directive)s has landed. Read our blog post about this new functionality, and/or check out the documentation for even more examples. PR #640

v2.22.0

• When concatenating errors maintain a reference to the original for use downstream Issue #480 PR #637
• Improve generic typings for several resolver-related interfaces PR #662
• Remove copied apollo-link code PR #670
• Handle undefined path in getErrorsFromParent PR #667

v2.21.0

• Make iterall a runtime dependency PR #627
• Added support for lexical parser options PR #567
• Support graphql@^0.13.0 PR #567
• Don't use Symbol in incompatible envs Issue #535 PR #631

v2.20.2

• Pass through apollo-link-http errors to originalError PR #621

v2.20.1

• Fix error.path could be undefined for schema stitching PR #617

v2.20.0

• Recreate enums and scalars for more consistent behaviour of merged schemas PR #613
• makeExecutableSchema and mergeSchema now accept an array of IResolver PR #612 PR #576 PR #577
• Fix delegateToSchema.ts to remove duplicate new variable definitions when delegating to schemas PR #607
• Fix duplicate subscriptions for schema stitching PR #609

v2.19.0

• Also recreate astNode property for fields, not only types, when recreating schemas. PR #580
• Fix delegateToSchema.js to accept and move forward args with zero or false values PR #586

Commits

• ca06efa Bump NPM version to 2.23.1 in preparation for publishing.
• 55ff203 Do not enforce query directive locations.
• 247067c CHANGELOG for v2.23.0.
• c91e577 Remove unnecessary print and subsequent parse (#678)
• 42c7296 Add section about query directives to schema directive docs.
• ccf13cc Small tweaks to the date formatting example.
• ad76736 Add documentation of date that adds a field argument.
• d5577e4 Add a test for formatting dates with field arguments.
• 402b59c Resolvers are optional arguments (#679)
• 37dd034 More newlines in uniqueID example documentation.
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #256.