Require NZ account number suffix to start with a zero

[osasko-gc]

NZ account number suffixes are two digits (00-99). Where they are given as three digits, the leading digit is padding and is always a zero, so 3 digit suffixes not starting with a zero are rejected.

• NZ account_number_format becomes \d{7}0\d{2}
• bumps the gem to 1.34.0
• fixes stale NZ account_number/account_number_suffix examples in the README

Risks

This rejects some details that are valid today. Consuming applications that recompute hashes/derived fields from a stored IBAN, or that re-validate on read, will start getting different results for such an account.

[osasko-gc]

json 3.0 stopped tolerating the //-commented blocks these fixtures used to disable stale rule examples (added in 4fdddbe, 2020), which broke bundle exec rspec on master as of the json 3.0.0 Dependabot bump around 2026-09-07. Rule000300/000900 remain covered by other active cases in germany_unit_test_cases.json; Rule001900 had no active coverage already.