Merge pull request #2096 from CentreForDigitalHumanities/dependabot/pip/backend/pypdf-6.13.0

Bump pypdf from 6.12.0 to 6.13.0 in /backend

Author: lukavdplas

backend/requirements.txt

@@ -168,7 +168,7 @@ pyopenssl==24.2.1
     # via pysaml2
 pyparsing==3.2.5
     # via rdflib
-pypdf==6.12.0
+pypdf==6.13.0
     # via -r requirements.in
 pyreadr==0.5.4
     # via -r requirements.in