Bump FluentAssertions from 6.12.1 to 6.12.2 (#264) #589

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Job	Run time
DotNet 3.1.x windows-latest	1m 43s
DotNet 3.1.x macos-latest	36s
DotNet 3.1.x ubuntu-latest	36s
DotNet 6.0.x windows-latest	1m 44s
DotNet 6.0.x macos-latest	51s
DotNet 6.0.x ubuntu-latest	35s
DotNet 7.0.x windows-latest	3m 1s
DotNet 7.0.x macos-latest	36s
DotNet 7.0.x ubuntu-latest	1m 33s
	11m 15s