Update dependency graphql to v0.13.2

Created by: renovate[bot]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
graphql	dependencies	patch	0.13.2	source

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Release Notes

graphql/graphql-js

v0.13.2

Compare Source

New:

• Allow buildSchema() to take options (#​1249)
• Update to Flow v0.68 (#​1290)

Fixes:

• Update iterall (#​1254)
• buildSchema: Make options optional (#​1270)

v0.13.1

Compare Source

New:

• Publish .mjs files for module code to support native esmodules (#​1244)
• Interface type definitions may now be extended with extendSchema (#​1222)
• isValidNameError utility is now exported as a non-throwing alternative to assertValidName (#​1237)
• ExectuableDefinitionNode Flow type is now exported (#​1241)

Fixes:

• extendSchema now preserves (and allows extending) a list of legacy field names which would otherwise be considered invalid (#​1235)
• Replaced a misplaced licensing header (7e68984)

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