chore(deps): update dependency fakeiteasy to v8 (#117)

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

Author: renovate[bot]

EPPlusTest/EPPlusTest.csproj

@@ -24,7 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="FakeItEasy" Version="7.4.0" />
+    <PackageReference Include="FakeItEasy" Version="8.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
     <PackageReference Include="MSTest.TestAdapter" Version="3.2.0" />
     <PackageReference Include="MSTest.TestFramework" Version="3.2.0" />