Force ubuntu based actions to use Ubuntu 22.04. #399

Job	Run time
common-steps	1m 32s
build-doxygen	3m 34s
build-windows (pkg-win-snapshot)	6m 54s
build-linux (pkg-posix-nightly)	2m 43s
build-windows (pkg-win-deployment)	6m 51s
build-linux (pkg-posix-test)	3m 19s
build-windows (pkg-win)	6m 50s
build-linux (pkg-posix)	3m 12s
deploySite	1m 54s
release	51s
	37m 40s

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