Bump the uv group across 1 directory with 2 updates (#4670)

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

Author: dependabot[bot]

backend/pyproject.toml

@@ -99,9 +99,9 @@ dependencies = [
     "pydantic>=2.13.3",
     "gunicorn>=23.0.0",
     "tinycss2>=1.4.0",
-    "pypdf>=6.10.2",
+    "pypdf>=6.12.0",
     "ipython>=8.30.0",
-    "weasyprint>=63.1",
+    "weasyprint>=68.0",
     "opencv-python-headless>=4.10.0.84",
     "psycopg[c]==3.2.12",
     "sentence-transformers>=3.0.0",