fix: a11y low contrast in dark mode for code [AC-4348]

[Stefan3002]

Done

• Increased the contrast for the code element in dark mode.
• Screenshots show it was too low.
• The contrast is 5.13 now.

QA

• Open demo
• [Add QA steps]
• Review updated documentation:
  • [List any updated documentation for review]
    Look at a confirmation modal that says: Next time press SHIFT, the contrast of the SHIFT text should be increased and pass a11y guidelines

Check if PR is ready for release

If this PR contains Vanilla SCSS or macro code changes, it should contain the following changes to make sure it's ready for the release:

• PR should have one of the following labels to automatically categorise it in release notes:
  • Feature 🎁, Breaking Change 💣, Bug 🐛, Documentation 📝, Maintenance 🔨.
• Vanilla version in package.json should be updated relative to the most recent release, following semver convention
  • if existing APIs (CSS classes & macro APIs) are not changed it can be a bugfix release (x.x.X)
  • if existing APIs (CSS classes & macro APIs) are changed/added/removed it should be a minor version (x.X.0)
  • see the wiki for more details
• Any changes to component class names (new patterns, variants, removed or added features) or macros should be listed on the what's new page.

Fixes: AC-4348

Screenshots

[webteam-app]

Demo

Jenkins

demos.haus