Bump FluentAssertions from 5.6.0 to 5.9.0

Bumps [FluentAssertions](https://github.com/fluentassertions/fluentassertions) from 5.6.0 to 5.9.0.
- [Release notes](https://github.com/fluentassertions/fluentassertions/releases)
- [Commits](fluentassertions/fluentassertions@5.6.0...5.9.0)

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

src/common.props

@@ -19,7 +19,7 @@
     <AkkaVersion>1.3.14</AkkaVersion>
     <AkkaBootstrapVersion>0.2.1</AkkaBootstrapVersion>
     <AkkaPersistenceExtrasVersion>0.4.3</AkkaPersistenceExtrasVersion>
-    <FluentAssertionsVersion>5.6.0</FluentAssertionsVersion>
+    <FluentAssertionsVersion>5.9.0</FluentAssertionsVersion>
     <GoogleProtobufVersion>3.4.0</GoogleProtobufVersion>
     <PetabridgeCmdVersion>0.6.3</PetabridgeCmdVersion>
   </PropertyGroup>