Update actions/checkout action to v4 (#101) #411

Job	Run time
Lint	56s
Security Lint	43s
Check Types	1m 12s
SonarCloud	28s
Test Python 3.6 - ubuntu	5s
CodeQL Analyze	2m 57s
Test Python 3.7 - ubuntu	28s
Build Package	0s
Test Python 3.8 - ubuntu	24s
Scan Licenses	0s
Test Python 3.9 - ubuntu	26s
Test Python 3.6 - windows	1m 46s
Test Python 3.7 - windows	1m 8s
Test Python 3.8 - windows	1m 4s
Build docs	0s
Test Python 3.9 - windows	55s
Test Python 3.6 - macos	1m 12s
Test Python 3.7 - macos	43s
Test Python 3.8 - macos	51s
Test Python 3.9 - macos	38s
Test Build Python ${{ matrix.py }} - ${{ matrix.os }}	0s
Publish Package	0s
Publish Docs	0s
	15m 56s

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