(MINOR) Bump MSRV to 1.67 (#182) #597

Job	Run time
Unit tests (aarch64-unknown-linux-gnu, stable)	3m 16s
Unit tests (windows-latest, stable)	4m 31s
Unit tests (aarch64-unknown-linux-gnu, 1.67.0)	9m 50s
Unit tests with minimum versions of direct dependencies (windows-latest)	2m 44s
Unit tests (windows-latest, 1.67.0)	12m 14s
Unit tests with default features disabled (windows-latest)	2m 29s
Unit tests with minimum versions of direct dependencies (macos-latest)	7m 22s
Unit tests (macos-latest, stable)	45s
Unit tests with default features disabled (macos-latest)	38s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	1m 53s
Unit tests (macos-latest, 1.67.0)	11m 35s
Unit tests with default features disabled (ubuntu-latest)	1m 3s
Enforce Rust code format	11s
Unit tests (macos-13-xlarge, stable)	1m 23s
Unit tests (macos-13-xlarge, 1.67.0)	4m 45s
Clippy	1m 10s
Unit tests (ubuntu-latest, stable)	1m 14s
Unit tests (ubuntu-latest, 1.67.0)	5m 5s
Preflight docs.rs build	20s
Preflight crate publish (ubuntu-latest, stable)	11s
License / vulnerability audit (advisories)	20s
Check for unknown features in cfg attributes and macros	12s
Check for unused dependencies	1m 2s
License / vulnerability audit (bans licenses sources)	21s
Ensure (MAJOR) tag is used when making an API breaking change	58s
ReadXMP example	1m 4s
	1h 16m 36s

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