chore: bump the all group in /examples/msal-python with 2 updates

Bumps the all group in /examples/msal-python with 2 updates: [azure-keyvault-secrets](https://github.com/Azure/azure-sdk-for-python) and [msal](https://github.com/AzureAD/microsoft-authentication-library-for-python).


Updates `azure-keyvault-secrets` from 4.7.0 to 4.8.0
- [Release notes](https://github.com/Azure/azure-sdk-for-python/releases)
- [Changelog](https://github.com/Azure/azure-sdk-for-python/blob/main/doc/esrp_release.md)
- [Commits](Azure/azure-sdk-for-python@azure-keyvault-secrets_4.7.0...azure-keyvault-secrets_4.8.0)

Updates `msal` from 1.22.0 to 1.28.0
- [Release notes](https://github.com/AzureAD/microsoft-authentication-library-for-python/releases)
- [Commits](AzureAD/microsoft-authentication-library-for-python@1.22.0...1.28.0)

---
updated-dependencies:
- dependency-name: azure-keyvault-secrets
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
- dependency-name: msal
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: all
...

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

examples/msal-python/requirements.txt

@@ -1,2 +1,2 @@
-azure-keyvault-secrets==4.7.0
-msal==1.22.0
+azure-keyvault-secrets==4.8.0
+msal==1.28.0