fix(storage): update practices from deprecated ioutil to io in download_file_into_memory.go#4655

eapl-gemugami wants to merge 2 commits intoGoogleCloudPlatform:mainGoogleCloudPlatform/golang-samples:mainfrom

eapl-gemugami:paradalicea-fix-storage-update-practices-file-download-into-memoryeapl-gemugami/golang-samples:paradalicea-fix-storage-update-practices-file-download-into-memoryCopy head branch name to clipboard