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 ✅

Project coverage is 99.95%. Comparing base (83d6ffd) to head (5f0757e).
Report is 2 commits behind head on master.

❗ Current head 5f0757e differs from pull request most recent head fe0202b

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Additional details and impacted files

@@             Coverage Diff             @@
##            master    #2339      +/-   ##
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- Coverage   100.00%   99.95%   -0.05%     
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  Files          108      107       -1     
  Lines         2482     2449      -33     
  Branches       627      619       -8     
===========================================
- Hits          2482     2448      -34     
- Partials         0        1       +1     

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