Bump version file to `0.7.3` in prep for release #1208

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Run time

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Job	Run time
go-test / ubuntu (go this)	11m 47s
go-test / ubuntu (go next)	11m 51s
go-test / windows (go this)	1m 1s
go-test / windows (go next)	53s
go-test / macos (go this)	43s
go-test / macos (go next)	26s
	26m 41s