fix(ie/pps): accept 'B' as second letter (2024 rule)

[spokodev]

Ireland began issuing PPS numbers with B as the second letter on all new numbers as of 2024. The syntax regex omits B and the 2013-format check-digit branch only recognises A/H, so a valid number such as 1234567OB is rejected with InvalidFormat.

Align the regex ([ABHWTX]?) and the check-digit branch (ABH) with the current rule, matching the upstream python-stdnum reference (validate('1234567OB') → '1234567OB').

[gemini-code-assist]

Summary of Changes

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This pull request updates the Irish PPS number validation logic to support new formats introduced in 2024. By adjusting the regular expression and the check-digit validation branch, the library now correctly recognizes numbers containing 'B' as the second letter, ensuring compliance with current standards and parity with upstream implementations.

Highlights

• Regex Update: Updated the PPS number validation regex to include 'B' as a valid second letter, aligning with 2024 regulatory changes.
• Check-Digit Logic: Modified the check-digit validation logic to correctly process numbers containing 'B' in the second-to-last position.
• Test Coverage: Added a new test case to verify that PPS numbers with 'B' as the second letter are correctly validated.

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[gemini-code-assist]

Code Review

This pull request updates the Irish PPS number validator to support 'B' as a valid second letter, reflecting changes introduced in 2024. The updates include modifying the JSDoc documentation, updating the regular expression pattern, and adjusting the check digit validation logic to include 'B'. Additionally, a new unit test has been added to verify this functionality. There are no review comments, so no feedback is provided.

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