[workflows] Update GitHub actions to use modern tools (release_16x) #175
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Cherry-pick patches from release_17x, in order to build the release_16x branch of classic-flang-llvm-project and flang with GCC 12 and Clang 14/15 on Ubuntu 22.04. This squashes together the following commits:
The workflows in the flang repository test both release_16x and release_17x, and keeping the workflows consistent in these classic-flang-llvm-project branches simplifies the flang workflows.