fix(updater): Convert shell commands to PowerShell in workflow checko… #305

Job	Run time
cli-integration (macos)	4m 21s
updater-create-pr / validate-inputs	9s
updater-create-pr / cancel-previous-run	4s
cli-integration (windows)	43s
cli-integration (ubuntu)	14s
updater-test-args / cancel-previous-run	3s
updater-test-args / validate-inputs	8s
updater-test-args / update	11s
updater-create-pr / update	27s
updater-test-outputs	3s
	6m 23s

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