chore(toolchain): update toolchain to nightly-2024-04-18 #1056

Job	Run time
clippy	1m 27s
Build and test sgx in hardware	10m 12s
Build and test (native, nightly-2024-04-17)	9m 51s
Build and test sgx with Docker	5m 44s
fmt	29s
Test raiko-lib	1m 4s
Build and test (sp1, nightly-2024-04-17)	19m 51s
Build and test (risc0, stable)	28m 50s
Build and test (sgx, stable)	9m 3s
	1h 26m 31s

Provide feedback