Error: Error getting value from 'CurrentUser' on 'Cake.Core.IO.WindowsRegistry'.

### Prerequisites

- [X] I have written a descriptive issue title
- [X] I have searched [issues](https://github.com/cake-build/cake/issues) to ensure it has not already been reported

### Cake runner

Cake Frosting

### Cake version

2.1.0.0

### Operating system

Linux

### Operating system architecture

N/A

### CI Server

_No response_

### What are you seeing?

I am logging the Build Context in the Setup, it works on the Windows and fails on the Ubuntu.
```
context.Information(context.ToJson(Formatting.Indented))
```

### What is expected?

Please find the expected Output from Windows, I should get similar in Ubuntu
```
----------------------------------------
Setup
----------------------------------------
Cake Context Start
{
"SharedSettings": {},
"FileSystem": {},
"Environment": {
"WorkingDirectory": "D:/Repos/FleetHub/Build/cake-frosting/CakeBuild/bin/Debug/net5.0",
"ApplicationRoot": "D:/Repos/FleetHub/Build/cake-frosting/CakeBuild/bin/Debug/net5.0",
"Platform": {
"Family": "windows",
"Is64Bit": true
},
"Runtime": {
"BuiltFramework": {
"Identifier": ".NETCoreApp",
"Version": "5.0",
"Profile": "",
"FullName": ".NETCoreApp,Version=v5.0"
},
"Runtime": "coreClr",
"CakeVersion": "2.1.0.0",
"IsCoreClr": true
}
},
"Globber": {},
"Log": {
"Verbosity": "normal"
},
"Arguments": {},
"ProcessRunner": {},
"Registry": {
"CurrentUser": {},
"LocalMachine": {},
"ClassesRoot": {},
"Users": {},
"PerformanceData": {},
"CurrentConfig": {}
},
"Tools": {},
"Data": {},
"Configuration": {}
}
```

### Steps to Reproduce

Log the Build Context in the Setup
```
context.Information(context.ToJson(Formatting.Indented))
```

### Output log

_No response_

Start with Cake.Core.IO.WindowsRegistry and reproduce the Cake Frosting setup serialization on Ubuntu using context.Information(context.ToJson(Formatting.Indented)). Compare the Linux failure with the shown Windows output; done means logging the build context no longer throws when the CurrentUser registry value is read.

Written by the indexing model from the issue text.