- Removed `ElsaStudioVersion` from `Directory.Build.props`.
- Added `PackageVersions` group in `Directory.Packages.props` with `ElsaStudioVersion` and new `Moq` package version.
- Updated input retrieval method in `ConfigureLiquidEngine.cs` to use `ActivityInput`.
- Clarified import for `InvokingActivityCallback` in `ScheduledChildCallbackBehavior.cs`.
- Changed target framework to `net9.0` in `Elsa.Http.UnitTests.csproj` and updated package references for flexibility.