[ci] Update CI bucket

[Janpot]

We're closing the account under which the bucket was created and ownership of buckets can't be transferred. So we're recreating it.

On the new bucket I'm also using bucket policies to control object access instead of putting object ACL.

will have to update the dashboard as well: https://github.com/mui-org/mui-contributor-dashboard/blob/9010a86de7aee24aabc2dbb0ef421c8f6a267395/src/pages/SizeComparison.tsx#L150

To Do after merging:

• Update AWS_ACCESS_KEY_ID_ARTIFACTS and AWS_SECRET_ACCESS_KEY_ARTIFACTS in circle env vars to the new credentials for the circleci user
• copy old bucket's files (aws s3 cp s3://mui-org-material-ui/artifacts/master/ s3://mui-org-ci/artifacts/master/ --recursive)
• Open a follow up PR to replace the ..._TMP vars in the circleci config with the original ones and remove the bucket fallback
• remove the _TMP vars from circleci
• close the old account? (how much will it cost to delete the bucket?)

[mui-pr-bot]

No bundle size changes

Generated by 🚫 dangerJS against f23f203

[michaldudak]

Both the PR and the follow-up plans look sensible to me.