(maint) Update dependency JetBrains.Annotations to v2021.3.0

Author: renovate-bot

src/Spectre.Console.Registrars.SimpleInjector.Tests/Spectre.Console.Registrars.SimpleInjector.Tests.csproj

@@ -9,7 +9,7 @@
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
-        <PackageReference Include="JetBrains.Annotations" Version="2021.2.0" />
+        <PackageReference Include="JetBrains.Annotations" Version="2021.3.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.0.0" />
         <PackageReference Include="Moq" Version="4.16.1" />
         <PackageReference Include="Shouldly" Version="4.0.3" />