ci: upgrade to nightly-2022-07-26
and pin miri
nightly
#4915
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Motivation
As discovered in #4914, the
miri
CI check wasn't pinned to a specific nightly, and the nightly chosen in #4903 didn't have amiri
component.Solution
This PR pins the
miri
check to therust_nightly
env value and updates the nightly to a version that is compatible with everything else.