fix plugin version tagging #28

Job	Run time
build-and-test	2m 18s
build-pulumi-plugin (linux, amd64)	1m 31s
build-pulumi-plugin (linux, arm64)	1m 29s
lint	1m 40s
scan	34s
build-pulumi-plugin (darwin, arm64)	1m 40s
release	0s
	9m 12s

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