Remove no-std and actual-serde features #2098

Job	Run time
Docs - stable toolchain (recent)	1m 5s
Docs - nightly toolchain (recent)	37s
Lint - nightly toolchain (recent)	30s
Test - stable toolchain (minimal)	15m 41s
Bench - nightly toolchain (recent)	1m 29s
Test - stable toolchain (recent)	16m 18s
Embedded	1m 29s
Format - nightly toolchain	16s
Test - 1.63.0 toolchain (minimal)	25m 48s
Test - 1.63.0 toolchain (recent)	26m 11s
Integration tests - stable toolchain (26_0)	59s
Integration tests - stable toolchain (25_2)	48s
Test - nightly toolchain (minimal)	14m 17s
Test - nightly toolchain (recent)	14m 22s
Integration tests - stable toolchain (25_1)	58s
Integration tests - stable toolchain (25_0)	50s
Integration tests - stable toolchain (24_2)	1m 54s
Integration tests - stable toolchain (24_1)	48s
Integration tests - stable toolchain (24_0_1)	54s
Integration tests - stable toolchain (23_2)	54s
Integration tests - stable toolchain (23_1)	47s
Integration tests - stable toolchain (23_0)	1m 4s
Integration tests - stable toolchain (22_1)	56s
Integration tests - stable toolchain (22_0)	47s
Integration tests - stable toolchain (0_21_2)	1m 3s
Integration tests - stable toolchain (0_20_2)	1m 13s
Integration tests - stable toolchain (0_19_1)	48s
Integration tests - stable toolchain (0_18_1)	57s
Integration tests - stable toolchain (0_17_1)	48s
	2h 14m 31s

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