Bump NUnit3TestAdapter from 4.0.0-beta.2 to 4.0.0 in /Src (#79)

Author: dependabot[bot]

Src/AsyncAwaitBestPractices.UnitTests/AsyncAwaitBestPractices.UnitTests.csproj

@@ -6,7 +6,7 @@
     </PropertyGroup>
     <ItemGroup>
         <PackageReference Include="NUnit" Version="3.13.2" />
-        <PackageReference Include="NUnit3TestAdapter" Version="4.0.0-beta.2">
+        <PackageReference Include="NUnit3TestAdapter" Version="4.0.0">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>