Update dependency Soenneker.Tests.FixturedUnit to 4.0.2021 (#599)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

test/Soenneker.Utils.Strings.DiceCoefficient.Tests/Soenneker.Utils.Strings.DiceCoefficient.Tests.csproj

@@ -27,7 +27,7 @@
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>
         <PackageReference Include="Soenneker.Utils.Test" Version="3.0.294" />
-        <PackageReference Include="Soenneker.Tests.FixturedUnit" Version="4.0.2018" />
+        <PackageReference Include="Soenneker.Tests.FixturedUnit" Version="4.0.2021" />
     <PackageReference Include="xUnit.v3" Version="3.1.0" /></ItemGroup>
 
     <ItemGroup>