Merge rust-bitcoin/corepc#46: Enable running multiple Core v28 nodes #90

Job	Run time
Prepare	3s
Docs - stable toolchain (recent)	46s
Test - 1.63.0 toolchain (minimal)	2m 32s
Integration tests - stable toolchain (28_0)	1m 7s
Test - 1.63.0 toolchain (recent)	2m 30s
Verify - stable toolchain	10s
Test - stable toolchain (minimal)	40s
Integration tests - stable toolchain (27_1)	1m 6s
Test - stable toolchain (recent)	39s
Integration tests - stable toolchain (27_0)	1m 10s
Integration tests - stable toolchain (26_2)	59s
Integration tests - stable toolchain (26_1)	42s
Integration tests - stable toolchain (26_0)	1m 12s
Integration tests - stable toolchain (25_2)	1m 10s
Integration tests - stable toolchain (24_2)	43s
Integration tests - stable toolchain (23_2)	42s
Integration tests - stable toolchain (22_1)	1m 0s
Integration tests - stable toolchain (0_21_2)	45s
Integration tests - stable toolchain (0_20_2)	43s
Integration tests - stable toolchain (0_19_1)	1m 10s
Integration tests - stable toolchain (0_18_1)	1m 12s
Integration tests - stable toolchain (0_17_1)	1m 15s
Lint - nightly toolchain (recent)	38s
Docs - nightly toolchain (recent)	44s
Format - nightly toolchain	14s
Test - nightly toolchain (minimal)	47s
Test - nightly toolchain (recent)	48s
	25m 27s

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