chore(deps): update dependency snapshooter.nunit to v0.7.1 (#769)

Author: renovate[bot]

tests/System.IO.Abstractions.Tests/System.IO.Abstractions.Tests.csproj

@@ -21,6 +21,6 @@
     <PackageReference Include="Moq" Version="4.16.1" />
     <PackageReference Include="nunit" Version="3.13.2" />
     <PackageReference Include="NUnit3TestAdapter" Version="3.17.0" />
-    <PackageReference Include="Snapshooter.NUnit" Version="0.5.8" />
+    <PackageReference Include="Snapshooter.NUnit" Version="0.7.1" />
   </ItemGroup>
 </Project>