update MSRV #6

Job	Run time
Test 1.60 on ubuntu-latest ()	2m 43s
Test 1.60 on ubuntu-latest (--features character)	2m 38s
Test 1.60 on macos-latest ()	3m 8s
Test 1.60 on macos-latest (--features character)	3m 2s
Test 1.60 on windows-latest ()	3m 39s
Test 1.60 on windows-latest (--features character)	3m 42s
Test stable on ubuntu-latest ()	39s
Test stable on ubuntu-latest (--features character)	44s
Test nightly on ubuntu-latest ()	56s
Test nightly on ubuntu-latest (--features character)	46s
Test stable on macos-latest ()	1m 20s
Test stable on macos-latest (--features character)	1m 19s
Test nightly on macos-latest ()	1m 37s
Test nightly on macos-latest (--features character)	1m 31s
Test stable on windows-latest ()	2m 27s
Test stable on windows-latest (--features character)	2m 26s
Test nightly on windows-latest ()	1m 28s
Test nightly on windows-latest (--features character)	1m 33s
	35m 38s

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