Update metadata.json in preparation on 7.3.0-preview.1 release

[adityapatwardhan]

PR Summary

Update the metadata so dev build will pickup the correct version.

PR Context

Similar changes done for 7.1 -> 7.2 #14026

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Make sure all .h, .cpp, .cs, .ps1 and .psm1 files have the correct copyright header
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: or [ WIP ] to the beginning of the title (the WIP bot will keep its status check at Pending while the prefix is present) and remove the prefix when the PR is ready.
• Breaking changes
  • None
  • OR
  • Experimental feature(s) needed
    • Experimental feature name(s):
• User-facing changes
  • Not Applicable
  • OR
  • Documentation needed
    • Issue filed:
• Testing - New and feature
  • N/A or can only be tested interactively
  • OR
  • Make sure you've added a new test if existing tests do not effectively test the code changed
• Tooling
  • I have considered the user experience from a tooling perspective and don't believe tooling will be impacted.
  • OR
  • I have considered the user experience from a tooling perspective and opened an issue in the relevant tool repository. This may include:
    • Impact on PowerShell Editor Services which is used in the PowerShell extension for VSCode
      (which runs in a different PS Host).
      • Issue filed:
    • Impact on Completions (both in the console and in editors) - one of PowerShell's most powerful features.
      • Issue filed:
    • Impact on PSScriptAnalyzer (which provides linting & formatting in the editor extensions).
      • Issue filed:
    • Impact on EditorSyntax (which provides syntax highlighting with in VSCode, GitHub, and many other editors).
      • Issue filed:

[PaulHigin]

LGTM

[pull-request-quantifier-deprecated]

This PR has 9 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

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Quantification details

Label      : Extra Small
Size       : +5 -4
Percentile : 3.6%

Total files changed: 4

Change summary by file extension:
.cs : +2 -1
.ps1 : +2 -2
.json : +1 -1

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[adityapatwardhan]

@PaulHigin Please re-review.. some changes with new commit.

[iSazonov]

Nit: I wonder we keep old and unsupported versions here

[adityapatwardhan]

@PaulHigin is the PSCompatibleEdition needed for remoting?
@PowerShell/powershell-maintainers -- what do you think? Should 6.2.0 be removed?

[PaulHigin]

Not that I am aware of.

[iSazonov]

I'd remove 1,2,3 and 6 version, and maybe 4 too.

[ghost]

🎉v7.3.0-preview.1 has been released which incorporates this pull request.:tada:

Handy links:

• Release Notes