Update dependency govuk-elements-sass to v3.1.3

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
govuk-elements-sass	3.1.0 -> 3.1.3

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Release Notes

alphagov/govuk_elements (govuk-elements-sass)

v3.1.3

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Changes:

• Fix missing arrow on the <details> element in Firefox (PR #​534)
• Heading classes set to display: block; (PR #​552)
• Add class to adjust fieldset top margin when used after error summary (PR #​552)
• Change error layout for single-question form pages (PR #​552)

v3.1.2

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Guidance Changes

• Use h2 for error summary headings in form examples (#​510)
• Use aria-disabled to make disabled buttons compatible with older screen readers (JAWS 15 and below) (#​532)
• Change error summary ARIA role to "alert" (#​511)
• Reflect form validation error in page title (#​509)
• Remove "Example service name" from the confirmation page example (#​549)
• Remove tabindex attribute from the main element (#​534)
• Use the details polyfill from frontend toolkit (#​562)

Build Changes

• Update documentation to reference correct asset paths (#​531)
• Replace postinstall script with Heroku's postbuild script (#​530)
• Switch to Heroku deploying on successful CI run rather than triggering it from Travis (#​559)
• Ensure documentation styles don't override examples (#​548)

Dependencies

• Update govuk_template_jinja to 0.23.0 (#​558)
• Update govuk_frontend_toolkit to v7.1.0 (#​526, #​562)
• Update run-sequence to version 2.1.0 (#​537)

v3.1.1

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