Update dotnet monorepo to v5.0.8

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
Microsoft.AspNetCore.AzureAppServicesIntegration (source)	nuget	patch	5.0.7 -> 5.0.8
Microsoft.AspNetCore.Mvc.NewtonsoftJson (source)	nuget	patch	5.0.7 -> 5.0.8
Microsoft.AspNetCore.Mvc.Testing (source)	nuget	patch	5.0.7 -> 5.0.8
Microsoft.AspNetCore.TestHost (source)	nuget	patch	5.0.7 -> 5.0.8

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Release Notes

dotnet/aspnetcore

v5.0.8

Release

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Configuration

📅 Schedule: At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

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