bug symfony#48746 [Validator] Fix IBAN format for Tunisia and Mauritania (smelesh)

This PR was merged into the 5.4 branch.

Discussion
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[Validator] Fix IBAN format for Tunisia and Mauritania

| Q             | A
| ------------- | ---
| Branch?       | 5.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Tickets       | n/a
| License       | MIT
| Doc PR        | n/a

IBAN checksum (2 digits after country code) must not be hardcoded since it's calculated based on the rest of the IBAN characters.

Commits
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b72f013 [Validator] Fix IBAN format for Tunisia and Mauritania

Author: nicolas-grekas

src/Symfony/Component/Validator/Constraints/IbanValidator.php

@@ -102,7 +102,7 @@ class IbanValidator extends ConstraintValidator
         'MK' => 'MK\d{2}\d{3}[\dA-Z]{10}\d{2}', // Macedonia, Former Yugoslav Republic of
         'ML' => 'ML\d{2}[A-Z]{1}\d{23}', // Mali
         'MQ' => 'FR\d{2}\d{5}\d{5}[\dA-Z]{11}\d{2}', // Martinique
-        'MR' => 'MR13\d{5}\d{5}\d{11}\d{2}', // Mauritania
+        'MR' => 'MR\d{2}\d{5}\d{5}\d{11}\d{2}', // Mauritania
         'MT' => 'MT\d{2}[A-Z]{4}\d{5}[\dA-Z]{18}', // Malta
         'MU' => 'MU\d{2}[A-Z]{4}\d{2}\d{2}\d{12}\d{3}[A-Z]{3}', // Mauritius
         'MZ' => 'MZ\d{2}\d{21}', // Mozambique
@@ -127,7 +127,7 @@ class IbanValidator extends ConstraintValidator
         'SN' => 'SN\d{2}[A-Z]{1}\d{23}', // Senegal
         'TF' => 'FR\d{2}\d{5}\d{5}[\dA-Z]{11}\d{2}', // French Southern Territories
         'TL' => 'TL\d{2}\d{3}\d{14}\d{2}', // Timor-Leste
-        'TN' => 'TN59\d{2}\d{3}\d{13}\d{2}', // Tunisia
+        'TN' => 'TN\d{2}\d{2}\d{3}\d{13}\d{2}', // Tunisia
         'TR' => 'TR\d{2}\d{5}[\dA-Z]{1}[\dA-Z]{16}', // Turkey
         'UA' => 'UA\d{2}\d{6}[\dA-Z]{19}', // Ukraine
         'VA' => 'VA\d{2}\d{3}\d{15}', // Vatican City State