Bump pytz from 2022.1 to 2022.2.1 in /demo/graph_tutorial

Bumps [pytz](https://github.com/stub42/pytz) from 2022.1 to 2022.2.1.
- [Release notes](https://github.com/stub42/pytz/releases)
- [Commits](stub42/pytz@release_2022.1...release_2022.2.1)

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

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

Author: dependabot[bot]

demo/graph_tutorial/requirements.txt

@@ -9,7 +9,7 @@ msal==1.18.0
 pycparser==2.21
 PyJWT==2.4.0
 python-dateutil==2.8.2
-pytz==2022.1
+pytz==2022.2.1
 PyYAML==6.0
 requests==2.28.1
 six==1.16.0