Validate leap year dates correctly

[dannyhajj]

Type of change

• New feature
• Bug fix
• Security patch
• Documentation update

Description

Date validation is resulting in false negatives and positives for some people born on Feb-29 on a leap year. For example, 200002292399 is incorrectly failing validation:

>>> personnummer.Personnummer('200002292399').valid()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.10/site-packages/personnummer/personnummer.py", line 29, in __init__
    raise PersonnummerException(
personnummer.personnummer.PersonnummerException: 200002292399 Not a valid Swedish personal identity number!

Related issue
Replaces #46

Motivation

Allow people born on leap years to use services relying on this package 🙈

Checklist

• I have read the CONTRIBUTING document.
• I have read and accepted the Code of conduct
• Tests passes.
• Style lints passes.
• Documentation of new public methods exists.
• New tests added which covers the added code.

PS. I would like to add the 200002292399 SSN to the list of test data here: https://github.com/personnummer/meta/blob/master/testdata/list.json

However, when running the generateTestdata.php script it's generating different SSNs and I'm not sure how is your contribution flow for those test. I could use some help adding it. 😅

[frozzare]

Thanks, will check it out later today.

Regarding the generateTestdata.php we add special cases here with a comment to the issue, if you need help with it I can do it later today as well, but it should be easy even if it's php :)

[frozzare]

I've added a special case for this, so you should be able to test it correctly now personnummer/meta#57

[Johannestegner]

LGTM!

Thank you for the contribution :)