update: Bump rasn requirement from 0.18.0 to 0.20.1 in /sdk #2722

Job	Run time
Clippy	1m 52s
Preflight crate publish (ubuntu-latest, stable)	1m 10s
Enforce Rust code format	12s
Unit tests with minimum versions of direct dependencies (windows-latest)	1m 20s
Unit tests (windows-latest, stable)	2m 53s
Unit tests (WASM)	1m 18s
Unit tests with minimum versions of direct dependencies (macos-latest)	41s
Unit tests (windows-latest, 1.76.0)	8m 41s
Unit tests (aarch64-unknown-linux-gnu, stable)	3m 3s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	36s
Unit tests (macos-latest, stable)	40s
Unit tests (aarch64-unknown-linux-gnu, 1.76.0)	2m 48s
Unit tests (macos-latest, 1.76.0)	32s
Unit tests (ubuntu-latest, stable)	57s
Unit tests (ubuntu-latest, 1.76.0)	2m 3s
License / vulnerability audit (advisories)	32s
License / vulnerability audit (bans licenses sources)	21s
Preflight docs.rs build	1m 57s
Check for unused dependencies	2m 5s
	33m 41s

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