Not accepting PayPal input image statement with an alt message.

[raguay]

Describe the bug
I have a component that uses an input type image and it has an alt message also. But the svelte compiler is constantly warning that it needs an alt message.

Logs

(!) Plugin svelte: A11y: <input type="image"> element should have an alt, aria-label or aria-labelledby attribute
src/components/Donate.svelte
<input type="image" alt="PayPal: A safe way to make donations." src="https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif" border="0" name="submit">

To Reproduce
Have a component with the the html for a PayPal donate button. It will always generate the error when you compile. But, since it's a warning, I still get the processed files okay.

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Expected behavior
It should compile without errors since the input image element has an alt message.

Information about your Svelte project:

• Your browser and the version: (e.x. Chrome 52.1, Firefox 48.0, IE 10)
  NW.js version 40
• Your operating system: (e.x. OS X 10, Ubuntu Linux 19.10, Windows XP, etc)
  Macos Mogave
• Svelte version (Please check you can reproduce the issue with the latest release!)
  3.6.8
• Whether your project uses Webpack or Rollup
  Rollup 1.17
  Severity
  How severe an issue is this bug to you? Is this annoying, blocking some users, blocking an upgrade or blocking your usage of Svelte entirely?

It's just very annoying. I hate to have error messages/warnings.
Note: the more honest and specific you are here the more we will take you seriously.

Additional context
Add any other context about the problem here.

[Conduitry]

This is reproducible in the REPL.

<input type="image" alt="PayPal: A safe way to make donations." src="https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif" border="0" name="submit">

Svelte returns an incorrect warning about this element needing alt, aria-label, or aria-labelledby.

[Conduitry]

svelte/src/compiler/compile/nodes/Element.ts

Line 453 in abcdc74

if (type && type.get_static_value() === 'image') {

We're not actually checking whether one of the expected attributes is present before calling the function that emits the warning.

[Conduitry]

This is fixed in 3.6.11.