[whatwg/dom] Mark XSLT deprecated (PR #1499)

- [X] At least two implementers are interested (and none opposed):
   * Chromium (https://developer.chrome.com/docs/web-platform/deprecating-xslt)
   * Gecko (https://github.com/mozilla/standards-positions/issues/1287)
   * WebKit (https://github.com/whatwg/html/issues/11523#issuecomment-3149280766)
- [X] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * N/A (this is for deprecation, not removal)

- [x] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: https://crbug.com/435623334
   * Gecko: https://bugzilla.mozilla.org/show_bug.cgi?id=1990759
   * WebKit: https://bugs.webkit.org/show_bug.cgi?id=300785
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …
    Core documentation starts here: https://developer.mozilla.org/en-US/docs/Web/XML/XSLT
- [X] The top of this comment includes a [clear commit message](https://github.com/whatwg/meta/blob/main/COMMITTING.md) to use. 

See also:
- https://github.com/whatwg/html/pull/12805
- https://github.com/whatwg/html/pull/11563
- https://github.com/whatwg/dom/pull/1400

(See [WHATWG Working Mode: Changes](https://whatwg.org/working-mode#changes) for more details.)

You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/1499

-- Commit Summary --

  * Mark XSLT deprecated

-- File Changes --

    M dom.bs (3)

-- Patch Links --

https://github.com/whatwg/dom/pull/1499.patch
https://github.com/whatwg/dom/pull/1499.diff

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