Release 2.9.3.

This is a quick patch to ensure that there are no complications when
deploying from a DAO as we are running close to the 300 Tgas gas limit
when doing deploy_upgrade, and reduces the amount of votes required by
a DAO for deployment to a single vote.

Changes

• It is now possible for anyone to call the contract method
  deploy_upgrade by @joshuajbouw. #794

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Signed-off-by: dependabot[bot] support@github.com
Co-authored-by: Oleksandr Anyshchenko oleksandr.anyshchenko@aurora.dev
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>