Bump portalocker from 2.5.1 to 2.6.0 in /demo/graphtutorial

Bumps [portalocker](https://github.com/WoLpH/portalocker) from 2.5.1 to 2.6.0.
- [Release notes](https://github.com/WoLpH/portalocker/releases)
- [Changelog](https://github.com/wolph/portalocker/blob/develop/CHANGELOG.rst)
- [Commits](wolph/portalocker@v2.5.1...v2.6.0)

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

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

Author: dependabot[bot]

demo/graphtutorial/requirements.txt

@@ -8,7 +8,7 @@ idna==3.4
 msal==1.20.0
 msal-extensions==1.0.0
 msgraph-core==0.2.2
-portalocker==2.5.1
+portalocker==2.6.0
 pycparser==2.21
 PyJWT==2.6.0
 requests==2.28.1