The LightShaft.shader depended on some internal shader files from URP that changed. The shader needs to be updated to appropriately declare the the shader vertex description.
It's also recommended to check the upgrade guide here: https://docs.unity3d.com/Packages/com.unity.render-pipelines.universal@16.0/manual/upgrade-guide-2023-1.html#the-universal-renderer-is-now-using-the-rthandle-system