Bump sqlparse from 0.4.2 to 0.4.4 in /backend

Bumps [sqlparse](https://github.com/andialbrecht/sqlparse) from 0.4.2 to 0.4.4.
- [Changelog](https://github.com/andialbrecht/sqlparse/blob/master/CHANGELOG)
- [Commits](andialbrecht/sqlparse@0.4.2...0.4.4)

---
updated-dependencies:
- dependency-name: sqlparse
  dependency-type: direct:production
...

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

backend/requirements.txt

@@ -2,7 +2,7 @@ asgiref==3.7.2
 django==4.1.13
 djangorestframework==3.14.0
 django-cors-headers==4.3.1
-sqlparse==0.4.2
+sqlparse==0.4.4
 numpy==1.26.2
 pyyaml==6.0.1
 scikit-learn==1.3.2