(MINOR) Bump MSRV to 1.66.0 (#179) #576

Job	Run time
Enforce Rust code format	18s
Clippy	2m 5s
Preflight docs.rs build	29s
License / vulnerability audit (advisories)	25s
License / vulnerability audit (bans licenses sources)	26s
Preflight crate publish (ubuntu-latest, stable)	26s
ReadXMP example	1m 28s
Unit tests with default features disabled (windows-latest)	4m 5s
Unit tests with default features disabled (macos-latest)	2m 20s
Unit tests with minimum versions of direct dependencies (windows-latest)	3m 53s
Unit tests with default features disabled (ubuntu-latest)	1m 26s
Unit tests with minimum versions of direct dependencies (macos-latest)	3m 57s
Unit tests (windows-latest, stable)	4m 26s
Unit tests (aarch64-unknown-linux-gnu, stable)	3m 5s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	2m 31s
Unit tests (windows-latest, 1.66.0)	8m 42s
Unit tests (aarch64-unknown-linux-gnu, 1.66.0)	7m 4s
Unit tests (macos-latest, stable)	3m 1s
Check for unknown features in cfg attributes and macros	1m 39s
Unit tests (macos-latest, 1.66.0)	10m 33s
Unit tests (ubuntu-latest, stable)	1m 42s
Check for unused dependencies	2m 5s
Ensure (MAJOR) tag is used when making an API breaking change	8m 12s
Unit tests (ubuntu-latest, 1.66.0)	5m 50s
	1h 20m 8s

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