all: migrate to 1.28.7 (#2038) #7741

Job	Run time
golangci-lint	6m 1s
unit-tests(Check Go modules)	1m 2s
unit-tests(Check manifests)	1m 47s
unit-tests(Check auto-generated codes)	3m 14s
unit-tests(Verify gofmt)	1m 16s
unit-tests(Verify govet)	5m 6s
unit-tests(Run Go build)	3m 39s
unit-tests(Run Go test)	9m 12s
build-and-push (koordlet)	31m 30s
build-and-push (koord-manager)	17m 32s
build-and-push (koord-scheduler)	24m 57s
build-and-push (koord-descheduler)	23m 25s
	2h 8m 41s

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