[MOSEK] `.write` produces binary file instead of text file

The following code

```python
import pyoptinterface as poi
import pyoptinterface.mosek as mosek
m = mosek.Model()
x = m.add_variable(lb=0, ub=0)
m.optimize()
m.write("solution.sol")
```

Produces a `.sol` file but the file is gibberish. Is this expected? The mosek documentation seems to suggests the output should be a text file like the other solvers...