chore(deps): bump pypdf from 5.6.0 to 6.6.2 in /scripts

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 5.6.0 to 6.6.2.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@5.6.0...6.6.2)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.6.2
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

scripts/requirements.txt

@@ -21,7 +21,7 @@ pandas==2.3.0
 fpdf2==2.8.5
 
 # PDF reading (for AI Search upload)
-pypdf==5.6.0
+pypdf==6.6.2
 
 # Azure AI Search
 azure-search-documents==11.6.0