Update dependency pypdf to v4.3.1 (#2027)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

pyproject.toml

@@ -35,7 +35,7 @@ Changelog = "https://github.com/openoereb/pyramid_oereb/blob/master/CHANGES.rst"
 [project.optional-dependencies]
 # Dependencies listed in "recommend" must be included in "no-version" without explicit version number
 recommend = [
-    "pypdf==4.2.0",
+    "pypdf==4.3.1",
     "filetype==1.2.0",
     "geoalchemy2==0.15.1",
     "pyramid==2.0.2",