Bump isort from 5.13.2 to 6.0.0 #420

Job	Run time
Code quality	35s
Tests on ubuntu-latest and 3.9	13s
Tests on ubuntu-latest and 3.10	17s
Tests on ubuntu-latest and 3.11	18s
Tests on ubuntu-latest and 3.12	13s
Tests on ubuntu-latest and 3.13	11s
Tests on ubuntu-latest and pypy3.9	28s
Tests on ubuntu-latest and pypy3.10	22s
Tests on windows-latest and 3.9	1m 29s
Tests on windows-latest and 3.10	39s
Tests on windows-latest and 3.11	56s
Tests on windows-latest and 3.12	1m 8s
Tests on windows-latest and 3.13	53s
Tests on windows-latest and pypy3.9	1m 51s
Tests on windows-latest and pypy3.10	2m 7s
Tests on macos-latest and 3.9	39s
Tests on macos-latest and 3.10	31s
Tests on macos-latest and 3.11	20s
Tests on macos-latest and 3.12	23s
Tests on macos-latest and 3.13	17s
Tests on macos-latest and pypy3.9	48s
Tests on macos-latest and pypy3.10	37s
Code coverage	16s
	15m 31s

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