Update brave-ui dep to 7485c3c76bec747731c2085b6c5f97fcc62e1cc1

[petemill]

See diff at brave/brave-ui@9a6c7b4...7485c3c

Contains:

• Make dark theme more useful (@antonok-edm)

Required for brave/brave-browser#4262

Submitter Checklist:

• Submitted a ticket for my issue if one did not already exist.
• Used Github auto-closing keywords in the commit message.
• Added/updated tests for this change (for new code or code which already has tests).
• Verified that these changes build without errors on
  • Android
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that these changes pass automated tests (unit, browser, security tests) on
  • iOS
  • Linux
  • macOS
  • Windows
• Verified that all lint errors/warnings are resolved (npm run lint)
• Ran git rebase master (if needed).
• Ran git rebase -i to squash commits (if needed).
• Tagged reviewers and labelled the pull request as needed.
• Request a security/privacy review as needed.
• Add appropriate QA labels (QA/Yes or QA/No) to include the closed issue in milestone
• Public documentation has been updated as necessary. For instance:
  • https://github.com/brave/brave-browser/wiki/Deviations-from-Chromium-(features-we-disable-or-remove)
  • https://github.com/brave/brave-browser/wiki/Proxy-redirected-URLs
  • https://github.com/brave/brave-browser/wiki/Fingerprinting-Protection-Mode
  • https://github.com/brave/brave-browser/wiki/Brave%E2%80%99s-Use-of-Referral-Codes
  • https://github.com/brave/brave-browser/wiki/Custom-Headers
  • https://github.com/brave/brave-browser/wiki/Web-compatibility-issues-with-tracking-protection
  • https://github.com/brave/brave-browser/wiki/QA-Guide

Test Plan:

Reviewer Checklist:

• New files have MPL-2.0 license header.
• Request a security/privacy review as needed.
• Adequate test coverage exists to prevent regressions
• Verify test plan is specified in PR before merging to source

After-merge Checklist:

• The associated issue milestone is set to the smallest version that the
  changes has landed on.
• All relevant documentation has been updated.

[bsclifton]

I like this

[petemill]

CI issue seems like a build script failure working out the installer name from the channel. Seems unrelated. Merging...

2:40:22  + '[' = release ']'
12:40:22  /Users/jenkins/jenkins/workspace/er-build-pr_brave-ui-update-7485@tmp/durable-c9365a93/script.sh: line 2: [: =: unary operator expected
12:40:22  ++ tr '[:lower:]' '[:upper:]'
12:40:22  + CHANNEL_CAPITALIZED=
12:40:22  + '[' = release ']'
12:40:22  /Users/jenkins/jenkins/workspace/er-build-pr_brave-ui-update-7485@tmp/durable-c9365a93/script.sh: line 3: [: =: unary operator expected
12:40:22  + BROWSER='Brave Browser '
12:40:22  + OUT_DIR=/Users/jenkins/jenkins/workspace/er-build-pr_brave-ui-update-7485/src/out/
12:40:22  + '[' = true ']'
12:40:22  /Users/jenkins/jenkins/workspace/er-build-pr_brave-ui-update-7485@tmp/durable-c9365a93/script.sh: line 5: [: =: unary operator expected
12:40:22  + open '/Users/jenkins/jenkins/workspace/er-build-pr_brave-ui-update-7485/src/out//Brave Browser .dmg'
12:40:22  The file /Users/jenkins/jenkins/workspace/er-build-pr_brave-ui-update-7485/src/out//Brave Browser .dmg does not exist.