Bump certifi from 2026.6.17 to 2026.7.22

Bumps [certifi](https://github.com/certifi/python-certifi) from 2026.6.17 to 2026.7.22.
- [Commits](certifi/python-certifi@2026.06.17...2026.07.22)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.7.22
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements.txt

@@ -1,7 +1,7 @@
 asgiref==3.12.1
 astroid==3.3.11
 attrs==26.1.0
-certifi==2026.6.17
+certifi==2026.7.22
 charset-normalizer==3.4.8
 coreschema==0.0.4
 coverage==7.15.2