Bump azure-core from 1.32.0 to 1.33.0 in /backend

Bumps [azure-core](https://github.com/Azure/azure-sdk-for-python) from 1.32.0 to 1.33.0.
- [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-core_1.32.0...azure-core_1.33.0)

---
updated-dependencies:
- dependency-name: azure-core
  dependency-version: 1.33.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]