Bump Akka.TestKit.Xunit2 from 1.5.47 to 1.5.55

---
updated-dependencies:
- dependency-name: Akka.TestKit.Xunit2
  dependency-version: 1.5.55
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -6,7 +6,7 @@
   <!-- Test dependencies -->
   <ItemGroup>
     <PackageVersion Include="Akka.Cluster.Hosting" Version="1.5.46" />
-    <PackageVersion Include="Akka.TestKit.Xunit2" Version="1.5.47" />
+    <PackageVersion Include="Akka.TestKit.Xunit2" Version="1.5.55" />
     <PackageVersion Include="Grpc.Tools" Version="2.72.0" />
     <PackageVersion Include="Microsoft.Extensions.Hosting" Version="9.0.8" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />