Bump FluentAssertions from 6.3.0 to 6.6.0 (#131)

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 6.3.0 to 6.6.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Changelog](https://github.com/fluentassertions/fluentassertions/blob/develop/AcceptApiChanges.ps1)
- [Commits](fluentassertions/fluentassertions@6.3.0...6.6.0)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

src/common.props

@@ -22,7 +22,7 @@
     <NetCoreTestVersion>netcoreapp3.1</NetCoreTestVersion>
     <NetTestVersion>net5.0</NetTestVersion>
     <NetStandardLibVersion>netstandard2.0</NetStandardLibVersion>
-    <FluentAssertionsVersion>6.3.0</FluentAssertionsVersion>
+    <FluentAssertionsVersion>6.6.0</FluentAssertionsVersion>
     <FsCheckVersion>2.9.0</FsCheckVersion>
     <AkkaVersion>1.4.35</AkkaVersion>
     <!--