Bump FluentDateTime from 2.0.0 to 2.1.0 (#6151)

Bumps [FluentDateTime](https://github.com/FluentDateTime/FluentDateTime) from 2.0.0 to 2.1.0.
- [Release notes](https://github.com/FluentDateTime/FluentDateTime/releases)
- [Commits](FluentDateTime/FluentDateTime@2.0.0...2.1.0)

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

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src/core/Akka.Discovery.Tests/Akka.Discovery.Tests.csproj

@@ -10,7 +10,7 @@
 
   <ItemGroup>
     <PackageReference Include="FluentAssertions" Version="$(FluentAssertionsVersion)" />
-    <PackageReference Include="FluentDateTime" Version="2.0.0" />
+    <PackageReference Include="FluentDateTime" Version="2.1.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="$(TestSdkVersion)" />
     <PackageReference Include="xunit" Version="$(XunitVersion)" />
     <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitVersion)" />