Bug: Add key to stacks

[agubler]

Type: bug

The following has been addressed in the PR:

• [ ] There is a related issue
• [ ] All code matches the style guide
• [ ] Unit tests are included in the PR
• [ ] For new widgets, an entry has been added to the .dojorc
• [ ] For new widgets, theme.variant() is added to the root domnode
• [ ] Any widget variant uses theme.compose like this
• [ ] WidgetProperties are exported

Description:

Add key to stack children wrappers

[vercel[bot]]

This pull request is being automatically deployed with Vercel (learn more).
To see the status of your deployments, click below or on the icon next to each commit.

dojo.widgets – ./

🔍 Inspect: https://vercel.com/dojo/dojo.widgets/5nfPA8RAF4NnPNmRgnyWe5cHYcvt
✅ Preview: https://dojowidgets-git-fork-agubler-add-key-to-stack-children-dojo1.vercel.app

widget-test-docs – ./

🔍 Inspect: https://vercel.com/dojo/widget-test-docs/EkcAJVraXcvnjF21kMCVVoAyiUJd
✅ Preview: https://widget-test-docs-git-fork-agubler-add-key-to-stack-99aee4-dojo1.vercel.app

[codecov[bot]]

Codecov Report

Merging #1758 (c55f8e5) into master (05f2d0a) will not change coverage. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1758   +/-   ##
=======================================
  Coverage   90.57%   90.57%           
=======================================
  Files          95       95           
  Lines        5232     5232           
  Branches     1429     1429           
=======================================
  Hits         4739     4739           
  Misses        241      241           
  Partials      252      252           

Impacted Files	Coverage Δ
src/stack/index.tsx	98.24% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more Δ = absolute <relative> (impact), ø = not affected, ? = missing data Powered by Codecov. Last update 05f2d0a...c55f8e5. Read the comment docs.