build(deps): bump activesupport from 6.0.3 to 6.0.3.1 in /docs

Bumps [activesupport](https://github.com/rails/rails) from 6.0.3 to 6.0.3.1.
- [Release notes](https://github.com/rails/rails/releases)
- [Changelog](https://github.com/rails/rails/blob/v6.0.3.1/activesupport/CHANGELOG.md)
- [Commits](https://github.com/rails/rails/compare/v6.0.3...v6.0.3.1

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>