Log Message:
py-pdf: update to 4.0.0.

## Version 4.0.0, 2024-01-19

### Deprecations (DEP)
-  Drop Python 3.6 support (#2369)
-  Remove deprecated code (#2367)
-  Remove deprecated XMP properties (#2386)

### New Features (ENH)
-  Add "layout" mode for text extraction (#2388)
-  Add Jupyter Notebook integration for PdfReader (#2375)
-  Improve/rewrite PDF permission retrieval (#2400)

### Bug Fixes (BUG)
-  PdfWriter.add_uri was setting the wrong type (#2406)
-  Add support for GBK2K cmaps (#2385)

### Maintenance (MAINT)
-  Return None instead of -1 when page is not attached (#2376)
-  Complete FileSpecificationDictionaryEntries constants (#2416)
-  Replace warning with logging.error (#2377)