Update base64 requirement from 0.21.2 to 0.22.1 in /sdk #2346

Job	Run time
Preflight docs.rs build	2m 0s
Enforce Rust code format	14s
Clippy	2m 16s
License / vulnerability audit (advisories)	23s
Preflight crate publish (ubuntu-latest, stable)	1m 13s
Unit tests with minimum versions of direct dependencies (windows-latest)	9m 24s
License / vulnerability audit (bans licenses sources)	27s
Unit tests (windows-latest, stable)	12m 59s
Unit tests (windows-latest, 1.74.0)	12m 19s
Unit tests (aarch64-unknown-linux-gnu, stable)	6m 8s
Unit tests (WASM)	1m 46s
Unit tests with minimum versions of direct dependencies (macos-latest)	2m 56s
Unit tests (macos-latest, stable)	3m 6s
Unit tests (aarch64-unknown-linux-gnu, 1.74.0)	5m 48s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	3m 11s
Unit tests (macos-latest, 1.74.0)	2m 25s
Unit tests (ubuntu-latest, stable)	3m 39s
Check for unused dependencies	2m 9s
Ensure (MINOR) tag is used when making an API breaking change	2m 3s
Unit tests (ubuntu-latest, 1.74.0)	3m 32s
	1h 17m 58s

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