chore(deps): bump pandas from 2.2.2 to 2.2.3 in /backend

Bumps [pandas](https://github.com/pandas-dev/pandas) from 2.2.2 to 2.2.3.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Commits](https://github.com/pandas-dev/pandas/compare/v2.2.2...v2.2.3)

---
updated-dependencies:
- dependency-name: pandas
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

backend/requirements.txt

@@ -55,7 +55,7 @@ unstructured==0.15.9
 nltk==3.9.1
 Markdown==3.7
 pypandoc==1.13
-pandas==2.2.2
+pandas==2.2.3
 openpyxl==3.1.5
 pyxlsb==1.0.10
 xlrd==2.0.1