Calculate time_since_last_sync in UTC time.

[Hatell]

Fixes issue when DST is changed between calculation.

[Copilot]

Pull Request Overview

This PR fixes a DST (Daylight Saving Time) issue in the scheduler by ensuring time calculations use UTC instead of local time. This prevents incorrect time_since_last_sync calculations when DST transitions occur between sync operations.

Key Changes:

• Modified current_time to use UTC timezone instead of naive local time

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[auvipy]

can you please also add test to verify the change? can you also link relevant issue as well?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.58%. Comparing base (ba33a9c) to head (6b726f5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #964      +/-   ##
==========================================
- Coverage   88.18%   87.58%   -0.60%     
==========================================
  Files          32       32              
  Lines        1007     1007              
  Branches      105       81      -24     
==========================================
- Hits          888      882       -6     
- Misses        101      107       +6     
  Partials       18       18              

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[auvipy]

please also check the failing tests due to this change

[cclauss]

https://docs.python.org/3/library/datetime.html#datetime.UTC was added in Python 3.11.