Bump version to 0.18.0 #65

Job	Run time
Upgrade Test	20m 37s
Integration tests with MySQL (8.0.25) / dbtest	58s
Integration tests with MySQL (8.0.26) / dbtest	1m 13s
Integration tests with MySQL (8.0.18) / dbtest	1m 15s
Integration tests with MySQL (8.0.27) / dbtest	1m 13s
Integration tests with MySQL (8.0.28) / dbtest	1m 14s
Integration tests with MySQL (8.0.30) / dbtest	1m 14s
Integration tests with MySQL (8.0.31) / dbtest	1m 15s
Integration tests with MySQL (8.0.32) / dbtest	1m 16s
Integration tests with MySQL (8.0.33) / dbtest	1m 15s
Integration tests with MySQL (8.0.34) / dbtest	1m 13s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.25.9) / e2e	35m 17s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.26.4) / e2e	36m 0s
Supported MySQL versions End-to-End Tests (8.0.25, 1.27.1) / e2e	37m 54s
Supported MySQL versions End-to-End Tests (8.0.18, 1.27.1) / e2e	38m 53s
Supported Kubernetes versions End-to-End Tests (8.0.34, 1.27.1) / e2e	37m 59s
Supported MySQL versions End-to-End Tests (8.0.28, 1.27.1) / e2e	35m 58s
Supported MySQL versions End-to-End Tests (8.0.27, 1.27.1) / e2e	37m 22s
Supported MySQL versions End-to-End Tests (8.0.30, 1.27.1) / e2e	35m 19s
Supported MySQL versions End-to-End Tests (8.0.26, 1.27.1) / e2e	38m 6s
Supported MySQL versions End-to-End Tests (8.0.31, 1.27.1) / e2e	37m 27s
Supported MySQL versions End-to-End Tests (8.0.33, 1.27.1) / e2e	37m 38s
Supported MySQL versions End-to-End Tests (8.0.34, 1.27.1) / e2e	37m 14s
Supported MySQL versions End-to-End Tests (8.0.32, 1.27.1) / e2e	37m 46s
	8h 35m 36s

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