fix(npm): use correct repo syntax in package.json

[cyclimse]

Summary

What's changed?

• Use correct repository syntax

Why do we need this?

• Publish job is failing yet again: https://github.com/scaleway/serverless-scaleway-functions/actions/runs/20094471901
• The error seems to be around a missing repository to check provenance from our package.json itself

How have you tested it?

• Checked docs: https://docs.npmjs.com/cli/v7/configuring-npm/package-json#repository

Checklist

• I have reviewed this myself
• There is a unit test covering every change in this PR
• I have updated the relevant documentation

Details