Build

Update Microsoft.AspNetCore.Mvc.Testing requirement from 6.0.* to 7.0.* #20

Job	Run time
cleanup-code (ubuntu-latest)	25s
build-and-test (ubuntu-latest)	37s
inspect-code (ubuntu-latest)	58s
cleanup-code (windows-latest)	1m 58s
build-and-test (windows-latest)	3m 36s
inspect-code (windows-latest)	4m 30s
cleanup-code (macos-latest)	1m 28s
build-and-test (macos-latest)	1m 42s
inspect-code (macos-latest)	2m 14s
publish	0s
	17m 28s

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