Svelte 5: bind:this no longer allows dynamic type on <input>

[techniq]

Describe the bug

In Svelte 4, you could use bind:this with a dynamic type..

<script>
  let type = 'text';
  let el;
</script>

<input {type} bind:this={el} />

but in Svelte 5 (runes or non-runes mode), this throws a compiler error: 'type' attribute must be a static text value if input uses two-way binding

This was explicitly checked and allowed in Svelte 4, so likely a regression.

Reproduction

• Svelte 4 REPL (works)
• Svelte 5 REPL (error)

Logs

index-a870eda6.js:83 CompileError: 'type' attribute must be a static text value if input uses two-way binding
    at sr (compiler.cjs@5.0.0-next.15:1:226153)
    at BindDirective (compiler.cjs@5.0.0-next.15:1:502150)
    at r (compiler.cjs@5.0.0-next.15:1:305770)
    at o (compiler.cjs@5.0.0-next.15:1:305833)
    at r (compiler.cjs@5.0.0-next.15:1:305770)
    at o (compiler.cjs@5.0.0-next.15:1:305833)
    at Object.next (compiler.cjs@5.0.0-next.15:1:112832)
    at r (compiler.cjs@5.0.0-next.15:1:305753)
    at next (compiler.cjs@5.0.0-next.15:1:305809)
    at _ (compiler.cjs@5.0.0-next.15:1:305020)

### System Info

```shell
svelte: `5.0.0-next.15`

Severity

blocking an upgrade