Fix parsing for zone offset seconds

[djc]

%::z is defined as:

Offset from the local time to UTC with seconds.

So it seems like we should support this better?

Fixes #1629.

[djc]

It seems strange that this errored?

[pitdicker]

These tests are just weird, and I had to fix them endless times during rebases of the branches where I fixed this offset parsing bug.

[codecov]

Codecov Report

❌ Patch coverage is 97.14286% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.90%. Comparing base (8b86349) to head (db464fa).
⚠️ Report is 67 commits behind head on main.

Files with missing lines	Patch %	Lines
src/format/scan.rs	93.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1639      +/-   ##
==========================================
- Coverage   91.11%   90.90%   -0.21%     
==========================================
  Files          37       37              
  Lines       17137    17137              
==========================================
- Hits        15614    15579      -35     
- Misses       1523     1558      +35     

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[pitdicker]

Sorry, I unfortunately don't have time at the moment 😞.

A complete fix with tests for this category of errors is in #1083.

[djc]

@pitdicker thanks for the quick response, and the pointer! Going to have a look at your PR.