chore(deps): update pypdfium2 requirement in /docreader

Updates the requirements on [pypdfium2](https://github.com/pypdfium2-team/pypdfium2) to permit the latest version.
- [Release notes](https://github.com/pypdfium2-team/pypdfium2/releases)
- [Commits](https://github.com/pypdfium2-team/pypdfium2/compare/5.0.0...5.8.0)

---
updated-dependencies:
- dependency-name: pypdfium2
  dependency-version: 5.8.0
  dependency-type: direct:production
...

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

docreader/pyproject.toml

@@ -16,7 +16,7 @@ dependencies = [
     "protobuf>=6.33.0",
     "pydantic>=2.13.4",
     "pypdf>=6.1.3",
-    "pypdfium2>=5.0.0",
+    "pypdfium2>=5.8.0",
     "python-docx>=1.2.0",
     "requests>=2.32.5",
     "textract==1.5.0",