Merge rust-bitcoin/corepc#75: Bump GitHub Actions Artifacts to v4 #160

Job	Run time
Test - 1.63.0 toolchain (minimal)	3m 28s
Prepare	7s
Docs - stable toolchain (recent)	42s
Integration tests - stable toolchain (28_0)	47s
Test - 1.63.0 toolchain (recent)	3m 29s
Integration tests - stable toolchain (27_1)	1m 11s
Verify - stable toolchain	17s
Integration tests - stable toolchain (27_0)	58s
Test - stable toolchain (minimal)	46s
Integration tests - stable toolchain (26_2)	1m 17s
Test - stable toolchain (recent)	56s
Integration tests - stable toolchain (26_1)	53s
Integration tests - stable toolchain (26_0)	56s
Integration tests - stable toolchain (25_2)	1m 8s
Integration tests - stable toolchain (24_2)	55s
Integration tests - stable toolchain (23_2)	1m 18s
Integration tests - stable toolchain (22_1)	44s
Integration tests - stable toolchain (0_21_2)	44s
Integration tests - stable toolchain (0_20_2)	50s
Integration tests - stable toolchain (0_19_1)	1m 0s
Integration tests - stable toolchain (0_18_1)	1m 26s
Integration tests - stable toolchain (0_17_1)	1m 12s
Format - nightly toolchain	12s
Lint - nightly toolchain (recent)	32s
Test - nightly toolchain (minimal)	51s
Docs - nightly toolchain (recent)	47s
Test - nightly toolchain (recent)	48s
	28m 14s

Provide feedback