Update actions/checkout action to v4 #414

Job	Run time
Lint	52s
SonarCloud	27s
Security Lint	51s
Test Python 3.6 - ubuntu	6s
Check Types	1m 4s
Test Python 3.7 - ubuntu	26s
CodeQL Analyze	2m 57s
Test Python 3.8 - ubuntu	24s
Test Python 3.9 - ubuntu	26s
Scan Licenses	0s
Test Python 3.6 - windows	1m 30s
Test Python 3.7 - windows	1m 9s
Build Package	0s
Test Python 3.8 - windows	56s
Build docs	0s
Test Python 3.9 - windows	52s
Test Python 3.6 - macos	1m 25s
Test Python 3.7 - macos	44s
Test Python 3.8 - macos	47s
Test Python 3.9 - macos	35s
Test Build Python ${{ matrix.py }} - ${{ matrix.os }}	0s
Publish Package	0s
Publish Docs	0s
	15m 31s

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