Bump powershell from 7.1.3-alpine-3.12-20210803 to 7.3.0-preview.1-alpine-3.12-20211215#16

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mainmicrosoft/ps-docs:mainfrom

dependabot/docker/powershell-7.3.0-preview.1-alpine-3.12-20211215microsoft/ps-docs:dependabot/docker/powershell-7.3.0-preview.1-alpine-3.12-20211215Copy head branch name to clipboard