Bump certifi from 2024.6.2 to 2024.7.4 in /app/backend (#1789)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2024.6.2 to 2024.7.4.
- [Commits](certifi/python-certifi@2024.06.02...2024.07.04)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pamela Fox <[email protected]>

Author: dependabot[bot]

app/backend/requirements.txt

@@ -64,7 +64,7 @@ blinker==1.8.2
     # via
     #   flask
     #   quart
-certifi==2024.6.2
+certifi==2024.7.4
     # via
     #   httpcore
     #   httpx