chore(deps): update stencil core (#30132)

We have shipped various of improvements to the Stencil project and
runtime. You can take a close look at our
[changelog](https://github.com/ionic-team/stencil/blob/main/CHANGELOG.md)
but since `v4.20.0` we mainly shipped improvements on the following
issues:

## Major Improvements:

- Enhanced Shadow DOM and hydration support
  - Improved client-side hydration for SSR
  - Better handling of shadow root styles and component hydration
  - More reliable serialization of Shadow DOM components

## Key Bug Fixes:

- Resolved performance issues due to detached nodes in memory
- Fixed several critical issues with scoped slots and component styling
- Improved handling of SVG class attributes and template tags
- Enhanced runtime decorator functionality
- Better handling of form-associated callbacks

## Technical Updates:

- Updated to TypeScript 5.5
- Added support for customizable Mermaid diagram colors in documentation

I don't see any critical changes that may impact Ionic users and feel
confident we can ship this.

## Dev Build

`8.5.4-dev.11744646756.1244bf71`

---------

Co-authored-by: Brandy Smith <brandyscarney@users.noreply.github.com>

core/src/css/structure.scss

@@ -22,10 +22,6 @@ html {
   text-size-adjust: 100%;
 }
 
-html:not(.hydrated) body {
-  display: none;
-}
-
 html.ion-ce body {
   display: block;
 }