fix(isMobilePhone): support Uzbekistan 77 prefix

[prayapti]

Summary

• Updated the Uzbekistan (uz-UZ) mobile phone validation regex to support the 77 prefix.
• Added a regression test for a phone number using the 77 prefix.

Testing

• npm test — 323 tests passing.

Checklist

• PR contains only related changes.
• README updated (not applicable).
• Tests written.
• References provided (where applicable).

Related issue: #2683

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9ff3424) to head (f131907).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2934   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2599      2599           
  Branches       658       658           
=========================================
  Hits          2599      2599           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.