Revert back to 1.78 as workspace MSRV #9231
Merged
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Last night's OSS-Fuzz build failed because the compiler used there hasn't been updated in quite some time. It's a nightly of 1.78 from the beginning of this year which means the bump to 1.79 recently for this workspace meant that Wasmtime stopped building there.
This commit reverts ac607ed and 1ad3da8 and then updates our github action to say that we're 3 versions behind the latest Rust right now with some commentary as to why.