Update Workhorse version to 8.48.0

What does this MR do?

Updates Workhorse version: https://gitlab.com/gitlab-org/gitlab-workhorse/-/tags/v8.48.0

WH Changelog:

## v8.48.0

### Changed
- Switch image scaler to a Go-only solution
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/603

### Other
- Push uploader control flow into objectstore package
  https://gitlab.com/gitlab-org/gitlab-workhorse/-/merge_requests/608

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• [-] Code review guidelines
• [-] Merge request performance guidelines
• [-] Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

N/A

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team