Bump Microsoft.Bcl.AsyncInterfaces from 7.0.0 to 8.0.0 (#1019)

Bumps [Microsoft.Bcl.AsyncInterfaces](https://github.com/dotnet/runtime) from 7.0.0 to 8.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](dotnet/runtime@v7.0.0...v8.0.0)

---
updated-dependencies:
- dependency-name: Microsoft.Bcl.AsyncInterfaces
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

Directory.Packages.props

@@ -16,7 +16,7 @@
     <PackageVersion Include="MessagePackAnalyzer" Version="$(MessagePackVersion)" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="2.2.0" />
     <PackageVersion Include="Microsoft.AspNetCore" Version="2.2.0" />
-    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" />
+    <PackageVersion Include="Microsoft.Bcl.AsyncInterfaces" Version="8.0.0" />
     <PackageVersion Include="Microsoft.CodeAnalysis.PublicApiAnalyzers" Version="3.3.4" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
     <PackageVersion Include="Microsoft.VisualStudio.Internal.MicroBuild.NonShipping" Version="$(MicroBuildVersion)" />