Update tutorials pub-sub csharp-subscriber image to dotnet 8.0

[antontroshin]

Description

Update tutorials pub-sub csharp-subscriber image to dotnet 8.0

Issue reference

We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1000

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

Hi that's really cool, @antontroshin thank you for the contribution. Does it work well with this change from what you can tell? ready to go? I'm running tests now.

[antontroshin]

I did test this locally, but had to do a few manual changes, due to the image location.
Using kind local cluster.

cd tutorials/pub-sub/csharp-subscriber
dotnet restore
dotnet build -o out
docker buildx build -t csharp-subscriber:test .
kind load docker-image csharp-subscriber:test
cd ..

Manually update tutorials/pub-sub/deploy/csharp-subscriber.yaml container image location and imagePullPolicy

...
      containers:
      - name: csharp-subscriber
        image: csharp-subscriber:test
        imagePullPolicy: IfNotPresent
...

Then apply the updated manifest
kubectl apply -f deploy/csharp-subscriber.yaml
Observe logs

➜  kubectl logs deployments/csharp-subscriber
Defaulted container "csharp-subscriber" out of: csharp-subscriber, daprd
warn: Microsoft.AspNetCore.Server.Kestrel[0]
      Overriding address(es) 'http://*:8080'. Binding to endpoints defined via IConfiguration and/or UseKestrel() instead.
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:5009
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /app

[marcduiker]

@holopin-bot @antontroshin Thanks!

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