Prepare for 0.29.2 release. #1484

Job	Run time
Lint	2m 31s
Test (ubuntu-latest, stable)	3m 18s
Check MSRV (ubuntu-latest, 1.68.2)	1m 46s
Test (ubuntu-latest, beta)	3m 21s
Check MSRV (macos-latest, 1.68.2)	1m 48s
Test (ubuntu-latest, nightly)	3m 5s
Test portable simd (ubuntu-latest, nightly)	45s
Check MSRV (windows-latest, 1.68.2)	2m 22s
Test wasm (stable, ubuntu-latest)	5m 58s
Test portable simd (macos-latest, nightly)	47s
Test (macos-latest, stable)	3m 7s
Test (macos-latest, beta)	2m 48s
Test portable simd (windows-latest, nightly)	1m 40s
Test (macos-latest, nightly)	3m 18s
Test (windows-latest, stable)	5m 58s
Test (windows-latest, beta)	5m 35s
Test (windows-latest, nightly)	5m 43s
	53m 50s

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