Prepare release of `string-interner` v0.18.0 (#74) #186

Job	Run time
Test Memory Consumption (ubuntu-latest)	37s
Test (ubuntu-latest)	39s
Test Memory Consumption (windows-latest)	2m 9s
Test (windows-latest)	2m 35s
Test Memory Consumption (macos-latest)	30s
Test (macos-latest)	1m 4s
Clippy	16s
Build (ubuntu-latest)	14s
Build (windows-latest)	1m 58s
Build (macos-latest)	19s
Documentation	10s
Formatting	14s
Audit	12s
Coverage	2m 50s
Miri	1m 15s
Outdated	8s
	15m 10s

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