fix: replace deprecated and removed import library with modern version

[stdavis]

load_source was deprecated at 3.4 and removed at 3.12.

Test results and coverage

==================================================================================== tests coverage ==================================================================================== 
___________________________________________________________________ coverage: platform win32, python 3.13.7-final-0 ____________________________________________________________________ 

Name                               Stmts   Miss Branch BrPart  Cover
--------------------------------------------------------------------
src\forklift\__init__.py               0      0      0      0   100%
src\forklift\arcgis.py               119     32     32      3    72%
src\forklift\change_detection.py      65      7     18      4    87%
src\forklift\config.py                55      1     22      2    96%
src\forklift\core.py                 256     28    120     15    87%
src\forklift\engine.py               557    200    196     18    61%
src\forklift\exceptions.py             2      0      0      0   100%
src\forklift\lift.py                 161     49     56      5    66%
src\forklift\messaging.py             97     43     32      3    52%
src\forklift\models.py               215     11     54      3    93%
src\forklift\seat.py                  39     15     10      0    61%
src\forklift\slack.py                215     35     92     33    76%
--------------------------------------------------------------------
TOTAL                               1781    421    632     86    73%
Coverage XML written to file cov.xml
=============================================================== 169 passed, 13 skipped, 9 warnings in 101.23s (0:01:41) ================================================================ 

Speed test results

Setting up speed test...
Tests ready starting dry run...
Changing data...
Repeating test...
Dry Run Output


    5 out of 5 pallets ran successfully in 79.45 seconds.
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:LargeDataPallet (42.21 seconds)
                           AddressPoints - Warning generated during update and data updated successfully.
crate message: duplicate features detected!
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:LargeDataPalletNoReproject (28480 ms)
                  AddressPointsNoProject - Warning generated during update and data updated successfully.
crate message: duplicate features detected!
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:ShapefilePallet (2869 ms)
                   CountiesFromShapefile - Created table successfully.
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:SmallDataPallet (3373 ms)
                                Counties - Data updated successfully.
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:TablePallet (1748 ms)
                              SchoolInfo - Created table successfully.

Repeat Run Output


    5 out of 5 pallets ran successfully in 65.74 seconds.
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:LargeDataPallet (5595 ms)
                           AddressPoints - Warning generated during update. Data not modified.
crate message: duplicate features detected!
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:LargeDataPalletNoReproject (55.22 seconds)
                  AddressPointsNoProject - Warning generated during update and data updated successfully.
crate message: duplicate features detected!
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:ShapefilePallet (1055 ms)
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:SmallDataPallet (2415 ms)
                                Counties - Data updated successfully.
C:\projects\forklift\src\forklift\..\..\speedtest\SpeedTestPallet.py:TablePallet (977 ms)


Speed Test Results
Dry Run: 79.45 seconds
Repeat: 65.74 seconds