fix: add codeServerVersion to vscode/product.json

[jsjoeio]

This PR fixes the code-server version in "Help: About"

Before

After

Fixes #4629

[github-actions]

✨ Coder.com for PR #4632 deployed! It will be updated on every commit.

• Host: https://codercom-ak763rb31-codercom.vercel.app/docs/code-server
• Last deploy status: success
• Commit: 52f4621
• Workflow status: https://github.com/coder/code-server/actions/runs/1593771964

[codecov]

Codecov Report

Merging #4632 (52f4621) into main (c4c480a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #4632   +/-   ##
=======================================
  Coverage   68.88%   68.88%           
=======================================
  Files          30       30           
  Lines        1655     1655           
  Branches      341      341           
=======================================
  Hits         1140     1140           
  Misses        438      438           
  Partials       77       77           

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