Add MSRV policy

6 jobs for master in 4 minutes and 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #6737
build:nightly

00:01:01

passed #6738
build:redox

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passed #6736
build:stable

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  Test
passed #6741
test:benches

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passed #6740
test:nightly

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passed #6739
test:stable

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