Update MSRV badge (#1812) #1163

Job	Run time
Test (stable)	48s
Test (beta)	3m 2s
Build documentation	1m 11s
Test (nightly)	2m 59s
Coverage	5m 22s
Bench	3m 9s
Test (1.65.0)	2m 40s
Test (stable, --features "std")	2m 58s
Check formatting	5s
Test (stable, --no-default-features)	58s
Test minimal rust version	1m 54s
Test (stable, --no-default-features --features "alloc")	45s
Test (nightly, --no-default-features)	48s
Test (nightly, --no-default-features --features "alloc")	47s
	27m 26s

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