Bump msgraph-sdk from 1.0.0a15 to 1.0.0a16 in /user-auth/graphtutorial

Bumps [msgraph-sdk](https://github.com/microsoftgraph/msgraph-sdk-python) from 1.0.0a15 to 1.0.0a16.
- [Release notes](https://github.com/microsoftgraph/msgraph-sdk-python/releases)
- [Changelog](https://github.com/microsoftgraph/msgraph-sdk-python/blob/main/CHANGELOG.md)
- [Commits](https://github.com/microsoftgraph/msgraph-sdk-python/commits)

---
updated-dependencies:
- dependency-name: msgraph-sdk
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

user-auth/graphtutorial/requirements.txt

@@ -92,7 +92,7 @@ msal-extensions==1.0.0
     # via azure-identity
 msgraph-core==1.0.0a4
     # via msgraph-sdk
-msgraph-sdk==1.0.0a15
+msgraph-sdk==1.0.0a16
     # via -r requirements.in
 multidict==6.0.4
     # via