Track MSRV in Cargo.toml #1566

Job	Run time
Build / Embedded	17s
Build / MSRV	2m 24s
Tests / MIPS (Big Endian)	2m 1s
Build / No deps	1m 19s
Tests / Stable	1m 3s
Tests / WebAssembly (WASI)	1m 0s
Tests / WebAssembly (wasm-bindgen)	1m 12s
Tests / OS: macos-latest - stable-x86_64-apple-darwin	3m 14s
Tests / OS: ubuntu-latest - stable-x86_64-gnu	2m 8s
Tests / OS: windows-latest - stable-x86_64-gnu	4m 8s
Tests / OS: windows-latest - stable-x86_64-msvc	7m 24s
Tests / OS: macos-latest - beta-x86_64-apple-darwin	3m 35s
Tests / OS: ubuntu-latest - beta-x86_64-gnu	2m 18s
Tests / OS: windows-latest - beta-x86_64-gnu	5m 21s
Tests / OS: windows-latest - beta-x86_64-msvc	4m 43s
Tests / OS: macos-latest - nightly-x86_64-apple-darwin	3m 26s
Tests / OS: ubuntu-latest - nightly-x86_64-gnu	2m 11s
Tests / OS: windows-latest - nightly-x86_64-gnu	4m 55s
Tests / OS: windows-latest - nightly-x86_64-msvc	2m 45s
	55m 24s

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