Use release version 0.3.0 #68

Job	Run time
Test - stable toolchain (minimal)	23s
Test - stable toolchain (recent)	26s
Prepare	2s
Docs - stable toolchain (recent)	29s
Integration tests - stable toolchain (26_0)	47s
Integration tests - stable toolchain (25_2)	1m 5s
Integration tests - stable toolchain (25_1)	40s
Integration tests - stable toolchain (25_0)	52s
Integration tests - stable toolchain (24_2)	40s
Integration tests - stable toolchain (24_1)	44s
Integration tests - stable toolchain (24_0_1)	1m 5s
Integration tests - stable toolchain (23_2)	1m 3s
Integration tests - stable toolchain (23_1)	55s
Integration tests - stable toolchain (23_0)	46s
Integration tests - stable toolchain (22_1)	44s
Integration tests - stable toolchain (22_0)	37s
Integration tests - stable toolchain (0_21_2)	1m 0s
Integration tests - stable toolchain (0_20_2)	59s
Integration tests - stable toolchain (0_19_1)	42s
Integration tests - stable toolchain (0_18_1)	56s
Integration tests - stable toolchain (0_17_1)	51s
Docs - nightly toolchain (recent)	27s
Test - nightly toolchain (minimal)	27s
Lint - nightly toolchain (recent)	35s
Test - nightly toolchain (recent)	34s
	17m 49s

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