fix(isPassportNumber): improve US locale

[yitzchak-schechter]

Update isPassportNumber to include new US passport number alphanumeric format

In the Next Generation US Passport, the passport number begins with a letter, followed by eight numbers.

• Regex updated to support both old and new patterns:
  • Old: 9 digits, /^\d{9}$/
  • New: 1 letter + 8 digits, /^[A-Z]\d{8}$/
  • Combined: /^\d{9}$|^[A-Z]\d{8}$/
• Added test cases for the new pattern.

Source: Information about the Next Generation U.S. Passport - travel.state.gov

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (fde5ed5) to head (dd56325).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2550   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          114       114           
  Lines         2535      2535           
  Branches       641       641           
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  Hits          2535      2535           

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