Merge pull request #1401 from SaschaSchwarze0/sascha-bump-grpc #2849

Job	Run time
integration (v1.25.11)	25m 23s
e2e (v1.25.11)	33m 26s
integration (v1.28.0)	25m 26s
test-docker-build (base)	43s
e2e (v1.28.0)	26m 54s
test-docker-build (git)	1m 29s
test-docker-build (image-processing)	1m 5s
unit	6m 0s
test-docker-build (waiter)	53s
	2h 1m 19s

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