🔒 fix: prevent loose type comparison vulnerability in Insee validator

[ronanguilloux]

🎯 What: The vulnerability fixed is the loose type comparison (==) when matching the departement part of the French Social Security Number (INSEE) extracted via regex.
⚠️ Risk: In PHP versions older than 8.0, loose type comparisons like '2A' == $return['departement'] could result in true due to unexpected type coercion (e.g. '2A' == 2 evaluating to true if $return['departement'] was evaluated as integer 2 somehow, or through magic hashes and other Type Juggling vulnerabilities). While preg_match limits the input, using === prevents this entire class of bugs.
🛡️ Solution: The fix replaces all instances of == with === within the switch(true) block in src/IsoCodes/Insee.php. Integer comparisons (97, 98, 99) are properly wrapped in quotes as they are checked against a string value. Redundant type casting was also removed.

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PR created automatically by Jules for task 12659231190581455542 started by @ronanguilloux

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