(MINOR) Update num_enum requirement from 0.6.0 to 0.7.0 (#178) #572

Job	Run time
Clippy	1m 38s
Enforce Rust code format	16s
License / vulnerability audit (advisories)	22s
License / vulnerability audit (bans licenses sources)	21s
Preflight docs.rs build	38s
Preflight crate publish (ubuntu-latest, stable)	29s
ReadXMP example	1m 37s
Unit tests with default features disabled (windows-latest, stable)	3m 39s
Unit tests with default features disabled (macos-latest, stable)	3m 7s
Unit tests with minimum versions of direct dependencies (windows-latest)	3m 21s
Unit tests with default features disabled (ubuntu-latest, stable)	1m 41s
Unit tests (windows-latest, stable)	3m 56s
Unit tests with minimum versions of direct dependencies (macos-latest)	3m 26s
Unit tests (aarch64-unknown-linux-gnu, stable)	3m 0s
Unit tests (windows-latest, 1.64.0)	7m 42s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	1m 37s
Unit tests (macos-latest, stable)	3m 47s
Unit tests (macos-latest, 1.64.0)	9m 23s
Unit tests (aarch64-unknown-linux-gnu, 1.64.0)	6m 44s
Check for unknown features in cfg attributes and macros	1m 22s
Unit tests (ubuntu-latest, stable)	2m 39s
Unit tests (ubuntu-latest, 1.64.0)	7m 10s
Check for unused dependencies	1m 27s
Ensure (MAJOR) tag is used when making an API breaking change	12m 10s
	1h 21m 32s

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