fix(isIBAN): narrow regex for VG

[ST-DDT]

The Virgin Islands Bank Codes can only be non numeric characters.

Sources

• https://en.wikipedia.org/wiki/International_Bank_Account_Number#IBAN_formats_by_country (Confirming that these parts represent the bank codes)
• https://www.mobilefish.com/services/random_iban_generator/random_iban_generator.php (Has the full IBAN pattern)
• https://wise.com/gb/swift-codes/countries/virgin-islands-uk (For a list of all bank codes)
• https://wise.com/gb/iban/british-virgin-islands (For validating an existing IBAN)
  • The IBANs used in the tests have been checked/confirmed by this

See also

• fix(finance): correct VG IBAN format faker-js/faker#2552

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 ✅

Comparison is base (b958bd7) 99.95% compared to head (5f0757e) 99.95%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2339      +/-   ##
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- Coverage   99.95%   99.95%   -0.01%     
==========================================
  Files         107      107              
  Lines        2454     2449       -5     
  Branches      619      619              
==========================================
- Hits         2453     2448       -5     
  Partials        1        1              

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