cargo: Sync up MSRV with CI by setting rust-version
#33
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This fixes the
+nightly -Zminimal-versions generate-lockfilestep to no longer generate aversion = 4Cargo.lockwhich is incompatible with our 1.74 MSRV.And it communicates to crates.io and newer
cargoversions with MSRV-aware resolver what our crate is going to be compatible with.Also drop the
macos-12runner CI: GitHub no longer hosts it, and we already havemacos-13andmacos-latestanyway.