chore(deps): replace `instant` with `web-time` #5348

Job	Run time
Cargo fmt	17s
Check unused dependencies	3m 4s
Cargo check (WASM)	1m 45s
Check documentation and run doc tests	1m 47s
Cargo clippy	1m 53s
Cargo check	1m 54s
Cargo clippy (WASM)	2m 2s
Test (no_std)	1s
Test (WASM)	1s
Test (Native)	1s
Test (Light Client)	1s
Test chainhead backend	1s
	12m 47s

Provide feedback