Update dependency AutoFixture.AutoNSubstitute to v4.18.1

Author: renovate[bot]

tests/Tests.csproj

@@ -10,7 +10,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="AutoFixture.AutoNSubstitute" Version="4.17.0" />
+    <PackageReference Include="AutoFixture.AutoNSubstitute" Version="4.18.1" />
     <PackageReference Include="AWSSDK.SecurityToken" Version="3.7.1.18" />
     <PackageReference Include="AWSSDK.S3" Version="3.7.1" />
     <PackageReference Include="AutoFixture.NUnit3" Version="4.17.0" />