Sign self generated DTLS certificate with SHA256 #4806

Job	Run time
ci (ubuntu-20.04, 18, Release)	6m 26s
ci (ubuntu-20.04, 18, Debug)	8m 7s
ci (ubuntu-22.04, 20, Release)	6m 10s
ci (ubuntu-22.04, 20, Debug)	7m 18s
ci (ubuntu-22.04, 22, Release)	6m 2s
ci (ubuntu-22.04, 22, Debug)	5m 8s
ci (ubuntu-24.04, 22, -Db_sanitize=address, Release)	8m 48s
ci (ubuntu-24.04, 22, -Db_sanitize=address, Debug)	6m 14s
ci (ubuntu-24.04, 22, -Db_sanitize=undefined, Release)	9m 37s
ci (ubuntu-24.04, 22, -Db_sanitize=undefined, Debug)	6m 20s
ci (ubuntu-24.04, 22, -Db_sanitize=thread, Release)	7m 1s
ci (ubuntu-24.04, 22, -Db_sanitize=thread, Debug)	8m 17s
ci (macos-12, 18, Release)	7m 36s
ci (macos-12, 18, Debug)	9m 29s
ci (macos-14, 20, Release)	3m 56s
ci (macos-14, 20, Debug)	5m 55s
ci (macos-14, 22, Release)	3m 53s
ci (macos-14, 22, Debug)	4m 0s
ci (windows-2022, 20, Release)	8m 6s
ci (windows-2022, 20, Debug)	8m 4s
ci (windows-2022, 22, Release)	8m 16s
ci (windows-2022, 22, Debug)	7m 26s
	2h 32m 9s

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