github: Build the pinned Ubuntu jobs on 22.04 #1646

Job	Run time
prepare	7s
macos	2h 22m 4s
msys2 (clang64)	1h 56m 41s
msys2 (mingw64)	2h 19m 49s
linux	2h 30m 0s
linux-asserts	0s
linux-test-cross-build-ffmpeg	0s
linux-cross-aarch64	3h 15m 17s
linux-cross-windows (x86_64, ucrt)	3h 6m 30s
linux-cross-windows (i686, ucrt)	3h 5m 36s
linux-cross-windows (aarch64, ucrt)	3h 5m 23s
linux-cross-windows (armv7, ucrt)	3h 2m 37s
test-toolchain (i686)	2m 18s
test-toolchain (x86_64)	2m 15s
test-compiler-rt	0s
test-ffmpeg	0s
test-libcxx	0s
test-openmp	0s
upload-nightly	0s
	1d 0h 48m 37s

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