Bump MSRV to 1.57 & improve the memory safety guarantees around `open_readonly`.#432

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briansmith wants to merge 2 commits intorust-random:masterfrom briansmith:b/cstr

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Commits on May 22, 2024

Bump MSRV to 1.57 for slice patterns nand better const fn.
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Improve the memory safety guarantees around open_readonly.
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