build(deps): Bump google-cloud-storage from 1.26.0 to 1.27.0 in /backend (#485)

Bumps [google-cloud-storage](https://github.com/googleapis/python-storage) from 1.26.0 to 1.27.0.
- [Release notes](https://github.com/googleapis/python-storage/releases)
- [Changelog](https://github.com/googleapis/python-storage/blob/master/CHANGELOG.md)
- [Commits](googleapis/python-storage@v1.26.0...v1.27.0)

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Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

backend/requirements.txt

@@ -5,7 +5,7 @@ fakeredis==1.4.0
 Flask==1.1.1
 Flask-Cors==3.0.8
 flask-talisman==0.7.0
-google-cloud-storage==1.26.0
+google-cloud-storage==1.27.0
 gunicorn==20.0.4
 python-dateutil==2.8.1
 pytoml==0.1.21