Error message while parsing cabal.project has odd artifact

### Describe the bug
While making a repro for #10957, I noticed an odd error message. It looks like:

```
Parse of field 'static' failed (True ): True
```

### To Reproduce
*See #10957*

### Expected behavior

I dunno, maybe something like:
```
Parse of field 'static' failed: "True "
static: True
^----
````

But I assume Cabal has better routines for printing errors it can already use. Using what it already has is better than making up something new.

### System information
- NixOS

```
$ cabal -V
cabal-install version 3.12.1.0
compiled using version 3.12.1.0 of the Cabal library
```