chore: address issues reported by yarn doctor

[vecerek]

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Description

Addresses all issues uncovered by yarn doctor (yarn dlx @yarnpkg/doctor), specifically:

• undeclared dependencies
• strings referencing the node_modules directory

For more details: https://yarnpkg.com/migration/pnp#calling-the-doctor

Builds on top of #732 and #733 and takes one step closer to the potential adoption of PnP.

Related #735

Type of change

internal change: make all dependencies explicit

Screenshots/Sandbox (if appropriate/relevant):

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How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] Test A
• [ ] Test B

Test Environment:

• OS:
• @graphql-codegen/...:
• NodeJS:

Checklist:

• [ ] I have followed the CONTRIBUTING doc and the style guidelines of this project
• [ ] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

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Latest commit: 4f11ff1991e567b3856d115467f353986d2c7987

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