chore(deps): fix outdated "vendored" dependency

[squirly]

The currently set version of the graphql-language-service bindings does not support graphql@15, causing npm to show peer-dependency errors when using graphql@15.

Show Error

npm WARN @apollographql/[email protected] requires a peer of graphql@^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN @apollographql/[email protected] requires a peer of graphql@^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN @apollographql/[email protected] requires a peer of graphql@^0.10.0 || ^0.11.0 || ^0.12.0 || ^0.13.0 || ^14.0.0 but none is installed. You must install peer dependencies yourself.
npm WARN @apollographql/[email protected] requires a peer of graphql@^0.12.0 || ^0.13.0 || ^14.0.0 but none is installed. You must install peer dependencies yourself

The current version of the library supports the newer version of graphql, getting around this error.

Fixes #2039
Fixes #1822
Fixes #2005

[squirly]

Since graphql-language-service-types uses newer TypeScript language features (typescript >= 3.8), typescript must first be updated before this change can be made (see #2085).

[bdow]

@squirly - I see in #2085 is attempting to do a major version bump of Typescript, though it is failing multiple circleci checks. Your note mentions it only needs to bump to 3.8, which seems to be a much simpler bump than doing a major version. Any chance we can do a minor bump to 3.8 for now in order to get this PR through and unblock users who want to upgrade to graphql@15?