Merge pull request #586 from cybozu-go/change_storage_version #391

Job	Run time
Upgrade Test	21m 36s
Integration tests with MySQL (8.0.28) / dbtest	6m 51s
Integration tests with MySQL (8.0.33) / dbtest	6m 10s
Integration tests with MySQL (8.0.34) / dbtest	6m 5s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.25.9) / e2e	43m 16s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.26.4) / e2e	41m 37s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.27.1) / e2e	48m 4s
Supported MySQL versions End-to-End Tests (8.0.28, 1.27.1) / e2e	47m 45s
Supported MySQL versions End-to-End Tests (8.0.33, 1.27.1) / e2e	41m 24s
Supported MySQL versions End-to-End Tests (8.0.34, 1.27.1) / e2e	49m 12s
	5h 12m 0s

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