fix: add empty object in place of variables for more consistent keys

[rliljest]

Description

Addresses potential issues stemming from mismatched generated keys.

Related #866

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

NOTE: Does have a fairly minor breaking change in case clients were hard-coding keys (not using generated helpers) and specifying "exact" react-query key matching

How Has This Been Tested?

Automated tests have been updated to accommodate this change

Test Environment:

• OS: macOS
• @graphql-codegen/typescript-react-query: 6.1.0

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

[changeset-bot]

🦋 Changeset detected

Latest commit: 3794bb1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@graphql-codegen/typescript-react-query	Patch

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