Merge rust-bitcoin/corepc#21: Public export of `serde_json` #29

Job	Run time
Docs - stable toolchain (recent)	40s
Test - 1.63.0 toolchain (minimal)	1m 25s
Prepare	3s
Integration tests - stable toolchain (28_0)	43s
Test - 1.63.0 toolchain (recent)	1m 30s
Test - stable toolchain (minimal)	35s
Integration tests - stable toolchain (27_1)	42s
Test - stable toolchain (recent)	31s
Integration tests - stable toolchain (27_0)	41s
Integration tests - stable toolchain (26_2)	44s
Integration tests - stable toolchain (26_1)	44s
Integration tests - stable toolchain (26_0)	51s
Integration tests - stable toolchain (25_2)	1m 0s
Integration tests - stable toolchain (25_1)	46s
Integration tests - stable toolchain (25_0)	46s
Integration tests - stable toolchain (24_2)	1m 4s
Integration tests - stable toolchain (24_1)	1m 3s
Integration tests - stable toolchain (24_0_1)	49s
Integration tests - stable toolchain (23_2)	54s
Integration tests - stable toolchain (23_1)	56s
Integration tests - stable toolchain (23_0)	47s
Integration tests - stable toolchain (22_1)	42s
Integration tests - stable toolchain (22_0)	39s
Integration tests - stable toolchain (0_21_2)	45s
Integration tests - stable toolchain (0_20_2)	51s
Integration tests - stable toolchain (0_19_1)	43s
Integration tests - stable toolchain (0_18_1)	1m 29s
Integration tests - stable toolchain (0_17_1)	1m 21s
Docs - nightly toolchain (recent)	48s
Lint - nightly toolchain (recent)	40s
Test - nightly toolchain (minimal)	37s
Test - nightly toolchain (recent)	37s
	26m 26s

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