Bump Microsoft.Bcl.AsyncInterfaces from 6.0.0 to 7.0.0

Bumps [Microsoft.Bcl.AsyncInterfaces](https://github.com/dotnet/runtime) from 6.0.0 to 7.0.0.
- [Release notes](https://github.com/dotnet/runtime/releases)
- [Commits](https://github.com/dotnet/runtime/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/core/Akka.Streams/Akka.Streams.csproj

@@ -15,7 +15,7 @@
     </ItemGroup>
     <ItemGroup Condition=" '$(TargetFramework)' == '$(NetStandardLibVersion)' ">
         <PackageReference Include="System.Reflection.TypeExtensions" Version="4.7.0" />
-        <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="5.0.0" />
+        <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" />
     </ItemGroup>
     <ItemGroup>
         <None Update="CodeGen\Dsl\GraphApply.tt">

src/core/Akka.TestKit/Akka.TestKit.csproj

@@ -28,7 +28,7 @@
     </ItemGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="6.0.0" />
+        <PackageReference Include="Microsoft.Bcl.AsyncInterfaces" Version="7.0.0" />
         <PackageReference Include="Nito.AsyncEx.Coordination" Version="5.1.2" />
         <PackageReference Include="Nito.AsyncEx.Context" Version="5.1.2" />
         <PackageReference Include="System.Linq.Async" Version="6.0.1" />