chore: upgrade @google-cloud/storage to 7.8.0 (stream-shift issue)

[MPV]

Here is the desired fix:

• fix: Cannot read properties of null (reading length) in stream-shift googleapis/nodejs-storage#2422

To fix the issue giving:

  /home/runner/_work/_actions/pass-culture-github-actions/gcs-cache/4857aab4515c00e04051f4da50c145f2a1d11019/dist/webpack:/gcs-cache/node_modules/stream-shift/index.js:16
      return state.buffer[0].length
  ^
  TypeError: Cannot read properties of null (reading 'length')
      at getStateLength (/home/runner/_work/_actions/pass-culture-github-actions/gcs-cache/4857aab4515c00e04051f4da50c145f2a1d11019/dist/webpack:/gcs-cache/node_modules/stream-shift/index.js:16:1)
      at shift (/home/runner/_work/_actions/pass-culture-github-actions/gcs-cache/4857aab4515c00e04051f4da50c145f2a1d11019/dist/webpack:/gcs-cache/node_modules/stream-shift/index.js:6:1)
      at Duplexify._forward (/home/runner/_work/_actions/pass-culture-github-actions/gcs-cache/4857aab4515c00e04051f4da50c145f2a1d11019/dist/webpack:/gcs-cache/node_modules/duplexify/index.js:170:1)
      at PassThrough.onreadable (/home/runner/_work/_actions/pass-culture-github-actions/gcs-cache/4857aab4515c00e04051f4da50c145f2a1d11019/dist/webpack:/gcs-cache/node_modules/duplexify/index.js:136:1)
      at PassThrough.emit (node:events:519:28)
      at emitReadable_ (node:internal/streams/readable:832:12)
      at processTicksAndRejections (node:internal/process/task_queues:81:21)