chore(deps): upgrade ristretto to v2

[StarpTech]

Motivation and Context

Checklist

Fixes since https://github.com/dgraph-io/ristretto/releases/tag/v2.0.0

• I have discussed my proposed changes in an issue and have received approval to proceed.
• I have followed the coding standards of the project.
• Tests or benchmarks have been added or updated.
• Documentation has been updated on https://github.com/wundergraph/cosmo-docs.
• I have read the Contributors Guide.

[github-actions]

Router image scan passed

✅ No security vulnerabilities found in image:

ghcr.io/wundergraph/cosmo/router:sha-5a64186b1f65dbed80b90eec2e706a6741da47f6

[alepane21]

Other than the small issue with the imports order, I tried for some regression with the
make test-parallel and haven't found one, so this change looks good to me!