Sign self generated DTLS certificate with SHA256 #4787

Job	Run time
ci (ubuntu-20.04, gcc, g++, true, 22, Release)	35m 11s
ci (ubuntu-20.04, gcc, g++, true, 22, Debug)	28m 15s
ci (ubuntu-20.04, clang, clang++, true, 22, Release)	29m 20s
ci (ubuntu-20.04, clang, clang++, true, 22, Debug)	25m 14s
ci (ubuntu-22.04, gcc, g++, 22, Release)	31m 4s
ci (ubuntu-22.04, gcc, g++, 22, Debug)	24m 13s
ci (ubuntu-22.04, clang, clang++, 22, Release)	31m 9s
ci (ubuntu-22.04, clang, clang++, 22, Debug)	26m 54s
ci (ubuntu-24.04, gcc, g++, true, 22, Release)	33m 26s
ci (ubuntu-24.04, gcc, g++, true, 22, Debug)	26m 19s
ci (ubuntu-24.04, clang, clang++, true, 22, Release)	33m 19s
ci (ubuntu-24.04, clang, clang++, true, 22, Debug)	29m 26s
ci (macos-12, gcc, g++, true, 22, Release)	8m 57s
ci (macos-12, gcc, g++, true, 22, Debug)	9m 18s
ci (macos-14, clang, clang++, true, 22, Release)	4m 58s
ci (macos-14, clang, clang++, true, 22, Debug)	5m 10s
ci (windows-2022, cl, cl, 22, Release)	7m 1s
ci (windows-2022, cl, cl, 22, Debug)	6m 17s
	6h 35m 31s

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