Update dependency FluentAssertions to v6.4.0 (#1885)
Update dependency FluentAssertions to v6.4.0 (#1885)

Co-authored-by: Renovate Bot <c71e7261d37a4f6ae4cfb0cbd79081310a237e67@renovateapp.com>
cucumber/gherkin-dotnet,cucumber/gherkin-dotnet,cucumber/gherkin-dotnet