fix: corrected the Costa Rican IBAN format

[MrGussio]

Fixes #643 by correcting the Costa Rican IBAN formatting

[codecov]

Codecov Report

Merging #646 (d0519e6) into main (a759c87) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head d0519e6 differs from pull request most recent head ff816b9. Consider uploading reports for the commit ff816b9 to get more accurate results

@@           Coverage Diff           @@
##             main     #646   +/-   ##
=======================================
  Coverage   99.33%   99.33%           
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  Files        1923     1923           
  Lines      176853   176857    +4     
  Branches      906      908    +2     
=======================================
+ Hits       175681   175687    +6     
+ Misses       1116     1114    -2     
  Partials       56       56           

Impacted Files	Coverage Δ
src/iban.ts	100.00% <100.00%> (ø)
src/vendor/unique.ts	95.16% <0.00%> (+1.61%)	⬆️

[ST-DDT]

Checked and seems to be working according to: https://www.iban.de/iban-pruefen.html

[Shinigami92]

Don't we have a test case for that? Nothing failed...
But I think we should add a test case for that because we also have tests for other ibans

See: https://github.com/faker-js/faker/blob/main/test/finance_iban.spec.ts

[MrGussio]

Don't we have a test case for that? Nothing failed... But I think we should add a test case for that because we also have tests for other ibans

See: https://github.com/faker-js/faker/blob/main/test/finance_iban.spec.ts

I added the test for Costa Rica to the test file and made issue #660 for the other tests of missing IBAN country codes.

In the latest commit I also splitted the reserved character from the banking digits of the Costa Rican IBAN formatting, to really cohere to the definitions I have found online.