Bump System.IO.Abstractions from 21.1.3 to 21.1.7

Bumps [System.IO.Abstractions](https://github.com/TestableIO/System.IO.Abstractions) from 21.1.3 to 21.1.7.
- [Release notes](https://github.com/TestableIO/System.IO.Abstractions/releases)
- [Commits](TestableIO/System.IO.Abstractions@v21.1.3...v21.1.7)

---
updated-dependencies:
- dependency-name: System.IO.Abstractions
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

BenchmarkMockNet/BenchmarkMockNet.csproj

@@ -16,7 +16,7 @@
 		<PackageReference Include="FakeItEasy" Version="8.3.0" />
 		<PackageReference Include="PCLMock" Version="5.1.3" />
 		<PackageReference Include="Rocks" Version="9.0.0" />
-		<PackageReference Include="System.IO.Abstractions" Version="21.1.3" />
+		<PackageReference Include="System.IO.Abstractions" Version="21.1.7" />
 	</ItemGroup>
 
 </Project>