Bump pypdf from 6.13.3 to 6.15.0 (#1056)

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 6.13.3 to 6.15.0.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@6.13.3...6.15.0)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.15.0
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements.txt

@@ -108,7 +108,7 @@ pygments==2.20.0
     # via mkdocs-material
 pymdown-extensions==11.0.1
     # via mkdocs-material
-pypdf==6.13.3
+pypdf==6.15.0
     # via mkdocs-exporter
 python-dateutil==2.9.0.post0
     # via