CI: Update `Dockerfile` to install OpenSSL 3 #271

Job	Run time
Test (ubuntu-latest, stable)	17s
Test (ubuntu-latest, stable, native-tls, dhall)	17s
Test (ubuntu-latest, stable, rustls)	18s
Test (ubuntu-latest, beta)	17s
Test (ubuntu-latest, beta, native-tls, dhall)	19s
Test (ubuntu-latest, beta, rustls)	19s
Test (ubuntu-latest, nightly)	18s
Test (ubuntu-latest, nightly, native-tls, dhall)	18s
Test (ubuntu-latest, nightly, rustls)	17s
Test (macos-latest, stable)	1s
Test (macos-latest, stable, native-tls, dhall)	1s
Test (macos-latest, stable, rustls)	1s
Test (macos-latest, beta)	11s
Test (macos-latest, beta, native-tls, dhall)	13s
Test (macos-latest, beta, rustls)	14s
Test (macos-latest, nightly)	14s
Test (macos-latest, nightly, native-tls, dhall)	13s
Test (macos-latest, nightly, rustls)	1s
Test (windows-latest, stable)	1s
Test (windows-latest, stable, native-tls, dhall)	1s
Test (windows-latest, stable, rustls)	1s
Test (windows-latest, beta)	20s
Test (windows-latest, beta, native-tls, dhall)	16s
Test (windows-latest, beta, rustls)	18s
Test (windows-latest, nightly)	18s
Test (windows-latest, nightly, native-tls, dhall)	17s
Test (windows-latest, nightly, rustls)	17s
Build release artifacts	0s
Create GitHub release	1s
	5m 39s

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