core:services:kraken:manifest: Fix fetch latest version #7501

Job	Run time
python-tests	3m 29s
frontend-tests	2m 10s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	10m 37s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	2m 27s
deploy-raspberry-image	-1s
	18m 42s

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