Update nightly toolchain pin (#25) #109

Job	Run time
Prepare	8s
Integration tests - stable toolchain (27_1)	55s
Test - 1.63.0 toolchain (minimal)	3m 9s
Integration tests - stable toolchain (27_0)	50s
Docs - stable toolchain (recent)	21s
Test - 1.63.0 toolchain (recent)	3m 6s
Test - stable toolchain (minimal)	21s
Integration tests - stable toolchain (26_2)	49s
Test - stable toolchain (recent)	23s
Integration tests - stable toolchain (26_1)	47s
Integration tests - stable toolchain (26_0)	49s
Integration tests - stable toolchain (25_2)	2m 14s
Integration tests - stable toolchain (25_1)	48s
Integration tests - stable toolchain (25_0)	52s
Integration tests - stable toolchain (24_2)	58s
Integration tests - stable toolchain (24_1)	46s
Integration tests - stable toolchain (24_0_1)	49s
Integration tests - stable toolchain (23_2)	47s
Integration tests - stable toolchain (23_1)	46s
Integration tests - stable toolchain (23_0)	59s
Integration tests - stable toolchain (22_1)	46s
Integration tests - stable toolchain (22_0)	1m 6s
Integration tests - stable toolchain (0_21_2)	54s
Integration tests - stable toolchain (0_20_2)	53s
Integration tests - stable toolchain (0_19_1)	1m 9s
Integration tests - stable toolchain (0_18_1)	1m 9s
Integration tests - stable toolchain (0_17_1)	57s
Docs - nightly toolchain (recent)	30s
Test - nightly toolchain (minimal)	29s
Test - nightly toolchain (recent)	25s
Lint - nightly toolchain (recent)	29s
	29m 24s

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