[w3c/manifest] Update manifest spec to consider manifest updates for icon urls to be cache-control:immutable (PR #1199)

Closes #???

This change (choose at least one, delete ones that don't apply):

* Adds new normative requirements

Implementation commitment (delete if not making normative changes):

* [ ] WebKit (https://bugs.webkit.org)
* [X] Chromium (https://crbug.com/403252561)
* [ ] Gecko (http://bugzilla.mozilla.org)

Commit message:

This change updates the manifest specification to consider manifest updates only if the icon urls have changed, mimicking the cache-control:immutable behavior.

Person merging, please make sure that commits are squashed with one of the following as a commit message prefix:

* chore:
* editorial:
* BREAKING CHANGE:
* And use none if it's a normative change


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<a href="https://pr-preview.s3.amazonaws.com/Dp-Goog/manifest/pull/1199.html" title="Last updated on Dec 8, 2025, 4:56 PM UTC (59632f6)">Preview</a> | <a href="https://pr-preview.s3.amazonaws.com/w3c/manifest/1199/6d104be...Dp-Goog:59632f6.html" title="Last updated on Dec 8, 2025, 4:56 PM UTC (59632f6)">Diff</a>
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/1199

-- Commit Summary --

  * Update

-- File Changes --

    M index.html (9)

-- Patch Links --

https://github.com/w3c/manifest/pull/1199.patch
https://github.com/w3c/manifest/pull/1199.diff

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