Bump govuk_elements_rails from 3.1.2 to 3.1.3
Bump govuk_elements_rails from 3.1.2 to 3.1.3

Bumps [govuk_elements_rails](https://github.com/alphagov/govuk_elements_rails) from 3.1.2 to 3.1.3.
- [Release notes](https://github.com/alphagov/govuk_elements_rails/releases)
- [Commits](https://github.com/alphagov/govuk_elements_rails/compare/v3.1.2...v3.1.3)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff,ministryofjustice/correspondence_tool_staff