Bump msal from 1.27.0 to 1.28.0 in /app-auth/graphapponlytutorial

Bumps [msal](https://github.com/AzureAD/microsoft-authentication-library-for-python) from 1.27.0 to 1.28.0.
- [Release notes](https://github.com/AzureAD/microsoft-authentication-library-for-python/releases)
- [Commits](AzureAD/microsoft-authentication-library-for-python@1.27.0...1.28.0)

---
updated-dependencies:
- dependency-name: msal
  dependency-type: indirect
...

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

Author: dependabot[bot]

app-auth/graphapponlytutorial/requirements.txt

@@ -92,7 +92,7 @@ microsoft-kiota-serialization-multipart==0.1.0
     # via msgraph-sdk
 microsoft-kiota-serialization-text==1.0.0
     # via msgraph-sdk
-msal==1.27.0
+msal==1.28.0
     # via
     #   azure-identity
     #   msal-extensions