fix(typescript-urql-graphcache): improve typing

[dargmuesli]

Description

Linting typescript-urql-graphcache's output file showed some room for improvement, so this PR resolves a duplicate import source and improves typing for "empty object".

Related # (issue)

https://github.com/dotansimha/graphql-code-generator-community/issues/1109 https://github.com/dotansimha/graphql-code-generator-community/issues/445

Type of change

Please delete options that are not relevant.

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Screenshots/Sandbox (if appropriate/relevant):

n/a

How Has This Been Tested?

• [x] existing test snapshots have been updated

Checklist:

• [x] I have followed the CONTRIBUTING doc and the style guidelines of this project
• [x] 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
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

Further comments

n/a

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 30ee6e8509b07a79e1ad2317b1499426057a93ea

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-urql-graphcache	Patch

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[dargmuesli]

let me kindly cc last editors of the changed line @beerose and @JoviDeCroock for review if time allows