fix value error in some cases while parsing date

[b3n4kh]

While parsing specific URLs like: https://www.mozilla.org/en-US/security/advisories/mfsa2024-17/

In this way:

from htmldate import find_date
find_date("https://www.mozilla.org/en-US/security/advisories/mfsa2024-17/")

The current regex will extract 2024-17 as a date and while parsing it inside search_page

It throws: ValueError: month must be in 1..12

This PR mitigates this, while remaining backwards compatible with all other test cases.

Right now for the test URL it only returns the fallback to the first year of the copyright mention.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.09%. Comparing base (b5b95da) to head (2cde8dd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #145   +/-   ##
=======================================
  Coverage   99.09%   99.09%           
=======================================
  Files           8        8           
  Lines         880      880           
=======================================
  Hits          872      872           
  Misses          8        8           

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[adbar]

Hi @b3n4kh, thanks for the fix and the tests!

I also wanted to address the issue so in the end I'll merge both PRs by making your pattern more restrictive.