bump .go-version with renovate

[peaceiris]

Is your feature request related to a problem? Please describe.

• https://github.com/actions/go-versions/blob/main/versions-manifest.json
• https://github.com/renovatebot/renovate/blob/main/lib/modules/datasource/golang-version/index.ts

Describe the solution you'd like

Describe alternatives you've considered

Additional context