Bump certifi from 2021.10.8 to 2022.6.15 in /demo/graph_tutorial

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.10.8 to 2022.6.15.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2021.10.08...2022.06.15)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

demo/graph_tutorial/requirements.txt

@@ -1,5 +1,5 @@
 asgiref==3.5.2
-certifi==2021.10.8
+certifi==2022.6.15
 cffi==1.15.1
 chardet==4.0.0
 cryptography==36.0.2