Bump certifi in /examples/sharedlinks/sharedlinks-backend

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.12.5 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2020.12.05...2022.12.07)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
...

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

examples/sharedlinks/sharedlinks-backend/requirements.txt

@@ -6,7 +6,7 @@
 #
 asgiref==3.3.1
     # via django
-certifi==2020.12.5
+certifi==2022.12.7
     # via requests
 chardet==4.0.0
     # via requests