Bump powershell

Bumps powershell from 7.1.3-alpine-3.12-20210803 to 7.3.0-preview.1-alpine-3.12-20211215.

---
updated-dependencies:
- dependency-name: powershell
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -3,7 +3,7 @@
 
 ARG MODULE_VERSION=0.9.0
 
-FROM mcr.microsoft.com/powershell:7.1.3-alpine-3.12-20210803
+FROM mcr.microsoft.com/powershell:7.3.0-preview.1-alpine-3.12-20211215
 SHELL ["pwsh", "-Command"]
 RUN $ProgressPreference = [System.Management.Automation.ActionPreference]::SilentlyContinue; \
     $Null = New-Item -Path /ps_modules/ -ItemType Directory -Force; \