build(deps): bump google-cloud-storage from 1.34.0 to 1.35.0 in /backend (#715)

Bumps [google-cloud-storage](https://github.com/googleapis/python-storage) from 1.34.0 to 1.35.0.
- [Release notes](https://github.com/googleapis/python-storage/releases)
- [Changelog](https://github.com/googleapis/python-storage/blob/master/CHANGELOG.md)
- [Commits](googleapis/python-storage@v1.34.0...v1.35.0)

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Author: dependabot[bot]

backend/requirements.txt

@@ -5,7 +5,7 @@ fakeredis==1.4.5
 Flask==1.1.2
 Flask-Cors==3.0.9
 flask-talisman==0.7.0
-google-cloud-storage==1.34.0
+google-cloud-storage==1.35.0
 gunicorn==20.0.4
 python-dateutil==2.8.1
 pytoml==0.1.21