Update brand assets link on dart.dev/brand

[kkboateng]

Page URL

https://dart.dev/brand

Page source

No response

Describe the problem

We need to update the link underlying "Dart and Flutter logo assets" in the third paragraph to the following link: https://services.google.com/fh/files/misc/dart_brand_guidelines_assets.zip

Expected fix

Update the link to: https://services.google.com/fh/files/misc/dart_brand_guidelines_assets.zip

Additional context

No response

I would like to fix this problem.

• [ ] I will try and fix this problem on dart.dev.