Build(deps): 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/Serilog.Sinks.Mongodb.TimeSeries.Tests/Serilog.Sinks.Mongodb.TimeSeries.Tests.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="FluentAssertions" Version="6.12.1"/>
+        <PackageReference Include="FluentAssertions" Version="7.0.0"/>
         <PackageReference Include="GitHubActionsTestLogger" Version="2.4.1"/>
         <PackageReference Include="Moq" Version="4.20.72"/>
         <PackageReference Include="nunit" Version="4.2.2"/>