CI: Pin dependencies for MSRV #315
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Loads of deps break MSRV at the moment because the Rust ecosystem is upgrading to edition 2021 left, right, and centre without bumping crate versions.
Pin various crates in CI for MSRV test run, do it in the CI script instead of in the github action.
I pulled this PR out of #312, the versions are what we use for MSRV 1.48, just pushing this to see if they work because CI is broken without some pinning.