Bump google/cloud-storage from 1.48.3 to 1.48.7 (#798)

Bumps [google/cloud-storage](https://github.com/googleapis/google-cloud-php-storage) from 1.48.3 to 1.48.7.
- [Release notes](https://github.com/googleapis/google-cloud-php-storage/releases)
- [Commits](googleapis/google-cloud-php-storage@v1.48.3...v1.48.7)

---
updated-dependencies:
- dependency-name: google/cloud-storage
  dependency-version: 1.48.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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