Add bugs metadata

[tonghuaxingdsb]

Summary

• add standard npm bugs.url metadata pointing to this repository's issue tracker
• add a changeset so the package metadata update can be published

The published package currently exposes homepage and repository metadata, but does not expose a usable bugs link in npm package metadata.

Verification

• node -e "const p=require('./package.json'); console.log(JSON.stringify({name:p.name,version:p.version,homepage:p.homepage,bugs:p.bugs,repository:p.repository},null,2)); if(p.name!=='babel-plugin-styled-components'||p.bugs?.url!=='https://github.com/styled-components/babel-plugin-styled-components/issues') process.exit(1)"
• git diff --check

[changeset-bot]

🦋 Changeset detected

Latest commit: 47fb2ba

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

This PR includes changesets to release 1 package

Name	Type
babel-plugin-styled-components	Patch

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