DirectoryAliases.MakeAbsolute computes the wrong path if the path contains ..

### 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

5.0.0

### Operating system

Windows

### Operating system architecture

x64

### CI Server

_No response_

### What are you seeing?

```csharp
var b = context.MakeAbsolute(context.Directory(".")); // C:/repos/repo/build
var d = context.MakeAbsolute(b.Combine(new DirectoryPath("../Dashboards"))); // C:/repos/repo/build/../Dashboards
```

### What is expected?

```csharp
var b = context.MakeAbsolute(context.Directory(".")); // C:/repos/repo/build
var d = context.MakeAbsolute(b.Combine(new DirectoryPath("../Dashboards"))); // C:/repos/repo/build/Dashboards
```

### Steps to Reproduce

```csharp
var b = context.MakeAbsolute(context.Directory("."));
var d = context.MakeAbsolute(b.Combine(new DirectoryPath("../Dashboards")));
```

### Output log

_No response_

Start at DirectoryAliases.MakeAbsolute and reproduce the issue with the Cake Frosting snippet on Windows using Cake 5.0.0. Trace how the combined DirectoryPath containing ../Dashboards is resolved, then verify the resulting path against the expected output shown in the issue.

Written by the indexing model from the issue text.