Bump demo versions to 4.9.3 (#1763) #739

Job	Run time
build-and-push / build-and-push-certifier	2m 10s
lint / actionlint	7s
lint / golint	1m 24s
lint / go-version-sync	7s
unit-tests / unit-test	4m 25s
build-and-push / build-and-push-server	5m 15s
lint / shellcheck	59s
	14m 27s

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