Bump certifi from 2023.11.17 to 2024.7.4 in /sample-apps/flask (#442)

Bumps [certifi](https://github.com/certifi/python-certifi) from 2023.11.17 to 2024.7.4.
- [Commits](certifi/python-certifi@2023.11.17...2024.07.04)

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

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

Author: dependabot[bot]

sample-apps/flask/requirements.txt

@@ -1,5 +1,5 @@
 boto3==1.34.26
-certifi==2023.11.17
+certifi==2024.7.4
 chardet==5.2.0
 Flask==2.3.3
 idna==3.7