chore(deps): bump pypdf from 6.1.1 to 6.1.3 in /src/backend (#10653)

* chore(deps): bump pypdf from 6.1.1 to 6.1.3 in /src/backend

Bumps [pypdf](https://github.com/py-pdf/pypdf) from 6.1.1 to 6.1.3.
- [Release notes](https://github.com/py-pdf/pypdf/releases)
- [Changelog](https://github.com/py-pdf/pypdf/blob/main/CHANGELOG.md)
- [Commits](https://github.com/py-pdf/pypdf/compare/6.1.1...6.1.3)

---
updated-dependencies:
- dependency-name: pypdf
  dependency-version: 6.1.3
  dependency-type: direct:production
...

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

* fix style

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matthias Mair <code@mjmair.com>

src/backend/requirements.txt

@@ -1383,9 +1383,9 @@ pyjwt[crypto]==2.10.1 \
     # via
     #   django-allauth
     #   djangorestframework-simplejwt
-pypdf==6.1.1 \
-    --hash=sha256:10f44d49bf2a82e54c3c5ba3cdcbb118f2a44fc57df8ce51d6fb9b1ed9bfbe8b \
-    --hash=sha256:7781f99493208a37a7d4275601d883e19af24e62a525c25844d22157c2e4cde7
+pypdf==6.1.3 \
+    --hash=sha256:8d420d1e79dc1743f31a57707cabb6dcd5b17e8b9a302af64b30202c5700ab9d \
+    --hash=sha256:eb049195e46f014fc155f566fa20e09d70d4646a9891164ac25fa0cbcfcdbcb5
     # via -r src/backend/requirements.in
 pyphen==0.17.2 \
     --hash=sha256:3a07fb017cb2341e1d9ff31b8634efb1ae4dc4b130468c7c39dd3d32e7c3affd \