Upgrade qpdf to v12 for solving `unable to find /Root dictionary`

The qpdf issue: <https://github.com/qpdf/qpdf/issues/1335>

Just use the file [case_08.pdf](https://github.com/user-attachments/files/18618452/case_08.pdf) (@PeterStaar-IBM provided) to reproduce:

```python3
parser = DoclingPdfParser(loglevel="debug")
parser.load(path_or_stream='case_08.pdf')
```
