Support for node 20

[stalet]

When uploading files with node 20 I get an error. By forcing node to use the latest version of @google-cloud/storage (7.7.0) the problems goes away.

---Uploading 4 files---
/home/travis/build/finn/organisation-frontend/node_modules/.pnpm/stream-shift@1.0.1/node_modules/stream-shift/index.js:16
    return state.buffer[0].length
                           ^
TypeError: Cannot read properties of null (reading 'length')
    at getStateLength (/home/travis/build/finn/organisation-frontend/node_modules/.pnpm/stream-shift@1.0.1/node_modules/stream-shift/index.js:16:28)
    at shift (/home/travis/build/finn/organisation-frontend/node_modules/.pnpm/stream-shift@1.0.1/node_modules/stream-shift/index.js:6:99)
    at Duplexify._forward (/home/travis/build/finn/organisation-frontend/node_modules/.pnpm/duplexify@4.1.2/node_modules/duplexify/index.js:170:35)
    at PassThrough.onreadable (/home/travis/build/finn/organisation-frontend/node_modules/.pnpm/duplexify@4.1.2/node_modules/duplexify/index.js:136:10)
    at PassThrough.emit (node:events:518:28)
    at emitReadable_ (node:internal/streams/readable:832:12)
    at process.processTicksAndRejections (node:internal/process/task_queues:81:21)
Node.js v20.11.0

[wkillerud]

I imagine the tests fail because the PR is from a fork, and doesn't get the configured secrets. I'll see about opening a local PR with these changes.

[wkillerud]

Continued in #145