v0.12.1 preparation #887

Job	Run time
build-windows	15m 18s
Validate external types appearing in public API	1m 14s
build (macOS-latest, stable)	11m 42s
Clippy (--all-features)	4m 46s
build (ubuntu-latest, stable)	5m 32s
Clippy (--no-default-features --features ring)	4m 40s
Measure coverage	5m 23s
build (ubuntu-latest, beta)	5m 48s
Documentation (stable)	38s
Clippy (--no-default-features --features aws_lc_rs)	4m 45s
build (ubuntu-latest, nightly)	5m 43s
Documentation (beta)	37s
Clippy (--no-default-features --features aws_lc_rs,pem)	4m 46s
Format	4s
build (ubuntu-latest, stable 7 months ago)	5m 55s
Documentation (nightly)	39s
Documentation (stable 7 months ago)	45s
Check semver compatibility	35s
	1h 18m 50s

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