Update Polaris version in app templates

[wantgoworld]

Which template or example

Specify the sample or template, and what flavor/language, if applicable.
order discount

Describe the bug

A clear and concise description of what the bug is.
clone the event and npm installl
Didn't do anything else.
X [ERROR] No matching export in "node_modules/@shopify/polaris/build/esm/index.js" for import "BlockStack"

Steps to reproduce

Include the Shopify CLI command to reproduce, if applicable.

Expected behavior

A clear and concise description of what you expected to happen.

Environment

• Operating system
• Shopify CLI version
  @shopify/cli/3.53.0 win32-x64 node-v20.10.0

Additional context

Add any other context about the problem here.

[hayesYeSain3]

+1

[devisscher]

Some templates are using previous versions of Polaris, so we need to update them to v12 plus.