Boost coverage for struct InlineStr #7

Job	Run time
Preflight crate publish (ubuntu-latest, stable)	16s
Unit tests (windows-latest, stable)	55s
Clippy	17s
Unit tests with minimum versions of direct dependencies (windows-latest)	35s
Unit tests (windows-latest, 1.72.0)	44s
Unit tests with minimum versions of direct dependencies (macos-latest)	40s
Unit tests (macos-latest, stable)	34s
Enforce Rust code format	12s
Unit tests with minimum versions of direct dependencies (ubuntu-latest)	14s
License / vulnerability audit (advisories)	19s
Unit tests (macos-latest, 1.72.0)	34s
License / vulnerability audit (bans licenses sources)	17s
Unit tests (ubuntu-latest, stable)	24s
Unit tests (ubuntu-latest, 1.72.0)	24s
Preflight docs.rs build	14s
Check for unused dependencies	16s
	6m 55s

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