Follow-up from pki-types conversion #1141

Job	Run time
Validate external types appearing in public API	1m 25s
build-windows	9m 3s
Build rustls-cert-gen as a standalone package	26s
build (macOS-latest, stable)	1m 3s
build (ubuntu-latest, stable)	46s
Clippy (--all-features)	4m 56s
build (ubuntu-latest, beta)	5m 51s
Measure coverage	6m 10s
Clippy (--no-default-features)	4m 31s
build (ubuntu-latest, nightly)	5m 35s
Documentation (stable)	1m 5s
Clippy (--no-default-features --features ring)	4m 38s
build (ubuntu-latest, stable 7 months ago)	55s
Documentation (beta)	58s
Clippy (--no-default-features --features aws_lc_rs)	5m 5s
Documentation (nightly)	1m 10s
Clippy (--no-default-features --features aws_lc_rs,pem)	4m 56s
Format	4s
Documentation (stable 7 months ago)	1m 5s
Check semver compatibility	59s
	1h 0m 41s

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