chore(deps): replace `instant` with `web-time` #5350

Job	Run time
Check unused dependencies	34s
Cargo fmt	21s
Cargo check	12m 26s
Cargo clippy	6m 3s
Check documentation and run doc tests	7m 15s
Cargo check (WASM)	1m 33s
Cargo clippy (WASM)	2m 16s
Test (no_std)	2m 10s
Test (Light Client)	7m 29s
Test chainhead backend	15m 37s
Test (WASM)	12m 15s
Test (Native)	15m 41s
	1h 23m 40s

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