Bump OpenTelemetry.Instrumentation.AspNetCore from 1.0.0-rc9.12 to 1.8.1 in /examples/ActorMetrics #2480

Job	Run time
build	1m 30s
test-fast (tests/Proto.Actor.Tests/*.csproj)	1m 6s
test-slow (net7.0, tests/Proto.Cluster.Tests/*.csproj)	2m 48s
test-fast (tests/Proto.Remote.Tests/*.csproj)	53s
test-slow (net7.0, tests/Proto.Cluster.PartitionIdentity.Tests/*.csproj)	1m 15s
test-fast (tests/Proto.OpenTelemetry.Tests/*.csproj)	51s
test-slow (net7.0, tests/Proto.Cluster.RedisIdentity.Tests/*.csproj)	1m 33s
test-fast (tests/Proto.Cluster.CodeGen.Tests/*.csproj)	36s
test-slow (net7.0, tests/Proto.Cluster.PubSub.Tests/*.csproj)	1m 23s
test-slow (net6.0, tests/Proto.Cluster.Tests/*.csproj)	2m 49s
test-slow (net6.0, tests/Proto.Cluster.PartitionIdentity.Tests/*.csproj)	1m 16s
test-slow (net6.0, tests/Proto.Cluster.RedisIdentity.Tests/*.csproj)	1m 35s
test-slow (net6.0, tests/Proto.Cluster.PubSub.Tests/*.csproj)	1m 22s
	18m 57s

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