simplify: use git ls-remote consistently for version detection #300

Job	Run time
cli-integration (windows)	35s
cli-integration (macos)	2m 52s
updater-test-args / validate-inputs	16s
updater-create-pr / cancel-previous-run	5s
updater-create-pr / validate-inputs	7s
updater-test-args / cancel-previous-run	5s
cli-integration (ubuntu)	15s
updater-create-pr / update	22s
updater-test-args / update	11s
updater-test-outputs	3s
	4m 51s

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