Update dotnet examples to net8.0 #285

Job	Run time
Kubernetes integration tests	1m 42s
TypeScript lint checks	1m 21s
DigitalOceanCs integration tests	57s
.NET unit tests (testing-unit-cs)	1m 21s
.NET unit tests (testing-unit-cs-mocks)	1m 19s
DigitalOceanJs integration tests	1m 22s
.NET unit tests (testing-unit-fs-mocks)	1m 15s
DigitalOceanTs integration tests	1m 16s
DigitalOceanPy integration tests	1m 6s
DigitalOceanFs integration tests	1m 13s
Python unit tests	1m 14s
Go unit tests	1m 14s
AwsCs integration tests	1m 10s
TypeScript unit tests	1m 17s
AwsJs integration tests	1m 20s
AwsTs integration tests	1m 6s
AwsPy integration tests	1m 0s
AwsFs integration tests	1m 20s
AzureCs integration tests	1m 17s
AzureJs integration tests	1m 15s
AzureTs integration tests	1m 17s
AzurePy integration tests	1m 15s
AzureFs integration tests	1m 21s
GcpCs integration tests	1m 12s
GcpJs integration tests	1m 12s
GcpTs integration tests	1m 15s
GcpPy integration tests	1m 8s
GcpFs integration tests	1m 21s
PacketCs integration tests	1m 2s
PacketJs integration tests	1m 18s
PacketTs integration tests	56s
PacketPy integration tests	1m 19s
PacketFs integration tests	1m 11s
EquinixMetalCs integration tests	1m 20s
EquinixMetalJs integration tests	1m 27s
EquinixMetalTs integration tests	1m 32s
EquinixMetalPy integration tests	1m 36s
EquinixMetalFs integration tests	1m 27s
CloudCs integration tests	1m 13s
CloudJs integration tests	1m 36s
CloudTs integration tests	1m 34s
CloudPy integration tests	59s
CloudFs integration tests	1m 4s
	54m 40s

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