Bump FakeItEasy from 7.3.1 to 8.1.0 in /src/dsc.tests

Bumps [FakeItEasy](https://github.com/FakeItEasy/FakeItEasy) from 7.3.1 to 8.1.0.
- [Release notes](https://github.com/FakeItEasy/FakeItEasy/releases)
- [Commits](FakeItEasy/FakeItEasy@7.3.1...8.1.0)

---
updated-dependencies:
- dependency-name: FakeItEasy
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

src/dsc.tests/dsc.tests.csproj

@@ -27,7 +27,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="FakeItEasy" Version="7.3.1" />
+    <PackageReference Include="FakeItEasy" Version="8.1.0" />
   </ItemGroup>
 
   <ItemGroup>

src/testhelpers/testhelpers.csproj

@@ -16,7 +16,7 @@
 
   <ItemGroup>
     <PackageReference Include="Autofac.Extras.FakeItEasy" Version="7.0.0" />
-    <PackageReference Include="FakeItEasy" Version="7.3.1" />
+    <PackageReference Include="FakeItEasy" Version="8.1.0" />
     <PackageReference Include="xunit" Version="2.6.6" />
   </ItemGroup>