ci: Update the GitHub Ubuntu runner image to Ubuntu 22.04. #5356

Job	Run time
osx clang --disable-ssl	3m 6s
linux rpm fedora	4m 45s
dpdk gcc	13s
linux deb no dpdk	4m 47s
linux gcc --disable-ssl	2m 4s
linux clang --disable-ssl	2m 23s
linux gcc c99	2m 18s
linux clang c99	2m 6s
linux gcc test	7m 29s
linux clang test asan	12m 56s
linux clang test ubsan	8m 59s
linux gcc test --enable-shared	10m 14s
linux clang test --enable-shared	11m 4s
linux gcc check check-dpdk dpdk	14m 59s
linux clang check check-dpdk dpdk	14m 43s
linux gcc test -ljemalloc	8m 17s
linux clang test -ljemalloc	8m 9s
linux gcc --enable-afxdp	2m 18s
linux clang --enable-afxdp	2m 7s
linux gcc dpdk --enable-shared	2m 58s
linux clang dpdk --enable-shared	2m 47s
linux gcc dpdk-shared	2m 18s
linux clang dpdk-shared	2m 20s
linux gcc dpdk-shared --enable-shared	3m 4s
linux clang dpdk-shared --enable-shared	2m 57s
linux gcc m32 --disable-ssl	2m 7s
linux gcc check-ovsdb-cluster	6m 10s
	2h 27m 38s

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