Bump FluentAssertions from 6.12.1 to 7.0.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.12.1 to 7.0.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.12.1...7.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

tests/Tests.Core/Tests.Core.csproj

@@ -20,7 +20,7 @@
     <PackageReference Include="JunitXml.TestLogger" Version="4.1.0" />
 
     <PackageReference Include="Nullean.VsTest.Pretty.TestLogger" Version="0.4.0" />
-    <PackageReference Include="FluentAssertions" Version="6.12.1" />
+    <PackageReference Include="FluentAssertions" Version="7.0.0" />
 
     <PackageReference Include="DiffPlex" Version="1.7.2" />
     <PackageReference Include="Proc" Version="0.8.2" />