Remove unused dependencies

[JohanBrorson]

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Is your feature request related to a problem? Please describe.

The @graphql-tools/prisma-loader package has dependencies that are unused, i.e. json-stable-stringify and @types/json-stable-stringify. json-stable-stringify has a dependency on jsonify, which is licensed under a Public Domain license. Public domain software has unclear legal implications which makes it problematic for corporations to use.

Describe the solution you'd like

Remove the json-stable-stringify and @types/json-stable-stringify dependencies, since they are unused. The usage of the packages appears to have been removed in https://github.com/ardatan/graphql-tools/pull/2732.

Describe alternatives you've considered

No other alternatives has been considered.

Additional context

N/A