Prepare 1.6.0 release #606

Job	Run time
Unit tests (windows-latest, stable)	2m 40s
Unit tests (aarch64-unknown-linux-gnu, stable)	2m 4s
Unit tests with minimum versions of direct dependencies (windows-latest)	4m 33s
Unit tests (windows-latest, 1.67.0)	2m 29s
Unit tests with default features disabled (windows-latest)	3m 14s
Unit tests (aarch64-unknown-linux-gnu, 1.67.0)	9m 14s
Unit tests (macos-latest, stable)	2m 30s
Unit tests with minimum versions of direct dependencies (macos-latest)	5m 24s
Unit tests with default features disabled (macos-latest)	2m 47s
Unit tests (macos-latest, 1.67.0)	2m 41s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	2m 6s
Unit tests with default features disabled (ubuntu-latest)	53s
Unit tests (macos-13-xlarge, stable)	1m 16s
Unit tests (macos-13-xlarge, 1.67.0)	1m 22s
Enforce Rust code format	16s
Unit tests (ubuntu-latest, stable)	1m 6s
Unit tests (ubuntu-latest, 1.67.0)	1m 23s
Clippy	1m 10s
Preflight crate publish (ubuntu-latest, stable)	12s
License / vulnerability audit (advisories)	20s
Preflight docs.rs build	21s
License / vulnerability audit (bans licenses sources)	17s
ReadXMP example	1m 26s
Check for unused dependencies	1m 5s
Ensure (MAJOR) tag is used when making an API breaking change	2m 20s
	53m 9s

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