Auto merge of #100606 - cuviper:upgrade-linux-ci, r=Mark-Simulacrum

ci: Upgrade non-dist Linux testers from ubuntu:16.04 to 22.04

The main goal of updating to 22.04 is to get away from `llvm.allow-old-toolchain`.
A side benefit is that they can also use the system `cmake` instead of building one.
This commit is contained in:
bors 2022-09-01 13:21:03 +00:00
commit 254f3c9887

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