Update mysql repo gpg key (#4069) #7227

Job	Run time
setup-environment	30s
generate-metrics	4m 5s
gofmt	3m 44s
coverage	5m 52s
cross-compile (binaries-darwin_amd64)	4m 36s
cross-compile (binaries-darwin_arm64)	4m 28s
lint	9m 38s
test	12m 40s
cross-compile (binaries-linux_amd64)	4m 42s
cross-compile (binaries-linux_arm64)	4m 15s
tidy	1m 4s
cross-compile (binaries-windows_amd64)	4m 18s
cross-compile (binaries-linux_ppc64le)	4m 16s
	1h 4m 8s

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