Update actions/checkout action to v4 #398

Job	Run time
Build Package	0s
Scan Licenses	0s
Build docs	0s
CodeQL Analyze	5m 32s
Lint	1m 29s
Security Lint	1m 8s
SonarCloud	53s
Check Types	1m 7s
Test Python 3.6 - ubuntu	12s
Test Python 3.7 - ubuntu	49s
Test Python 3.8 - ubuntu	37s
Test Python 3.9 - ubuntu	34s
Test Python 3.6 - windows	2m 41s
Test Python 3.7 - windows	1m 38s
Test Python 3.8 - windows	1m 21s
Test Python 3.9 - windows	1m 20s
Test Python 3.6 - macos	1m 36s
Test Python 3.7 - macos	58s
Test Python 3.8 - macos	1m 4s
Test Python 3.9 - macos	1m 12s
Test Build Python ${{ matrix.py }} - ${{ matrix.os }}	0s
Publish Package	0s
Publish Docs	0s
	24m 11s

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