build(deps): update pypdf requirement

Updates the requirements on [pypdf](https://github.com/py-pdf/pypdf) to permit the latest version.

Updates `pypdf` to 6.0.0
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@5.7.0...6.0.0)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.0.0
  dependency-type: direct:production
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pyproject.toml

@@ -63,7 +63,7 @@ python-docx = "1.2.0"
 xlrd = "2.0.2"
 xlwt = "1.3.0"
 pymupdf = "1.26.3"
-pypdf = "5.7.0"
+pypdf = "6.0.0"
 
 # 音频处理
 pydub = "0.25.1"