Bump sqlparse from 0.5.1 to 0.5.4 in /example

Bumps [sqlparse](https://github.com/andialbrecht/sqlparse) from 0.5.1 to 0.5.4.
- [Changelog](https://github.com/andialbrecht/sqlparse/blob/master/CHANGELOG)
- [Commits](https://github.com/andialbrecht/sqlparse/compare/0.5.1...0.5.4)

---
updated-dependencies:
- dependency-name: sqlparse
  dependency-version: 0.5.4
  dependency-type: direct:production
...

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

README.md

@@ -164,3 +164,7 @@ on the detected signposting metadata and produces output similar to the one show
 ## License
 
 Licensed under the MIT License.
+
+## References
+
+You can cite this library using this DOI: [10.5281/zenodo.15008517](https://doi.org/10.5281/zenodo.15008517).

example/requirements.txt

@@ -2,7 +2,7 @@ asgiref==3.8.1
 beautifulsoup4==4.12.3
 certifi==2024.8.30
 charset-normalizer==3.4.0
-django==5.1.4
+django==5.1.14
 django-json-ld==0.0.5
 django-signposting==0.10.0
 httplink==0.2.0
@@ -13,6 +13,6 @@ requests==2.32.3
 rfc3987==1.3.8
 signposting==0.9.9
 soupsieve==2.6
-sqlparse==0.5.1
+sqlparse==0.5.4
 urllib3==2.2.3
 rocrate==0.11.0