(MINOR) Bump MSRV to 1.66.0 #575

Job	Run time
Enforce Rust code format	19s
License / vulnerability audit (advisories)	23s
Preflight docs.rs build	32s
License / vulnerability audit (bans licenses sources)	22s
Clippy	1m 16s
Preflight crate publish (ubuntu-latest, stable)	21s
ReadXMP example	1m 34s
Unit tests with default features disabled (windows-latest)	4m 2s
Unit tests with minimum versions of direct dependencies (windows-latest)	3m 17s
Unit tests (windows-latest, stable)	3m 22s
Unit tests with default features disabled (macos-latest)	3m 11s
Unit tests with minimum versions of direct dependencies (macos-latest)	6m 23s
Unit tests (windows-latest, 1.66.0)	3m 9s
Unit tests with default features disabled (ubuntu-latest)	1m 19s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	2m 15s
Unit tests (aarch64-unknown-linux-gnu, stable)	2m 48s
Unit tests (macos-latest, stable)	2m 24s
Unit tests (macos-latest, 1.66.0)	4m 1s
Unit tests (aarch64-unknown-linux-gnu, 1.66.0)	8m 42s
Unit tests (ubuntu-latest, stable)	1m 27s
Unit tests (ubuntu-latest, 1.66.0)	1m 47s
Check for unknown features in cfg attributes and macros	1m 20s
Check for unused dependencies	1m 22s
Ensure (MAJOR) tag is used when making an API breaking change	11m 37s
	1h 7m 13s

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