Bump pypdf from 3.9.1 to 6.6.0 in /utils

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 3.9.1 to 6.6.0.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](py-pdf/pypdf@3.9.1...6.6.0)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.6.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

utils/requirements.txt

@@ -2,5 +2,5 @@ pyyaml==6.0
 fireo==1.6.2
 firebase_admin==4.5.2
 google-cloud-bigquery==3.10.0
-pypdf==3.9.1
+pypdf==6.6.0
 requests==2.31.0