Bump .NET 6 examples to .NET 8 (LTS) #2029

Job	Run time
comment-notification	0s
version / Calculate Dev Version	2s
build_test / Build binaries and schema	3m 50s
build_test / Build SDKs (nodejs)	9m 17s
build_test / Build SDKs (python)	7m 13s
build_test / Test Provider	9m 13s
build_test / Provider Dist	9m 6s
build_test / Build SDKs (dotnet)	13m 45s
build_test / Build SDKs (go)	15m 49s
build_test / Build SDKs (java)	5m 16s
build_test / Test pulumi/examples (nodejs)	3m 0s
build_test / Test SDKs (nodejs)	7m 36s
build_test / Test pulumi/examples (python)	2m 44s
build_test / Test SDKs (python)	8m 13s
build_test / Test pulumi/examples (dotnet)	2m 47s
build_test / Test SDKs (dotnet)	10m 26s
build_test / Test pulumi/examples (go)	2m 51s
build_test / Test pulumi/examples (java)	2m 28s
build_test / Test SDKs (go)	8m 45s
build_test / Test SDKs (java)	3m 6s
	2h 5m 27s

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