Bump FsUnit.xUnit from 6.0.1 to 7.0.0 in the test-lib group

Bumps the test-lib group with 1 update: [FsUnit.xUnit](https://github.com/fsprojects/FsUnit).


Updates `FsUnit.xUnit` from 6.0.1 to 7.0.0
- [Release notes](https://github.com/fsprojects/FsUnit/releases)
- [Changelog](https://github.com/fsprojects/FsUnit/blob/master/RELEASE_NOTES.md)
- [Commits](fsprojects/FsUnit@6.0.1...7.0.0)

---
updated-dependencies:
- dependency-name: FsUnit.xUnit
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: test-lib
...

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

src/pocof.Test/pocof.Test.fsproj

@@ -22,7 +22,7 @@
 
   <ItemGroup>
     <PackageReference Include="FsCheck.Xunit" Version="3.0.0-rc3" />
-    <PackageReference Include="FsUnit.xUnit" Version="6.0.1" />
+    <PackageReference Include="FsUnit.xUnit" Version="7.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0">