test: pin requested-version import for PSGalleryModule and PSResourceGet #110

Job	Run time
Continuous Integration / Run Tests (PowerShell 5.1)	2m 40s
Continuous Integration / Run Linters	21s
Continuous Integration / Run Tests (windows-latest)	1m 29s
Continuous Integration / Run Tests (ubuntu-latest)	53s
Continuous Integration / Run Tests (macOS-latest)	49s
Continuous Integration / Publish Unit Tests Results	13s
	6m 25s

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