Target net8.0 as minimum TFM for NuGet package #319

Job	Run time
build	1m 15s
test & benchmark (ubuntu-24.04-arm)	6m 26s
test & benchmark (windows-latest)	10m 39s
test & benchmark (macos-latest)	6m 0s
test & benchmark (ubuntu-latest)	5m 44s
summarize	7s
	30m 11s

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