[whatwg/fetch] Update CSM destinations to CSP Level 3. (PR #1536)

- [ ] At least two implementers are interested (and none opposed):
   *Change 'style-src' to 'style-src-elem'   
   * …Add name to Contributors
   - [ ] [Tests](https://github.com/web-platform-tests/wpt) are written and can be reviewed and commented upon at:
   * …
- [ ] [Implementation bugs](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) are filed:
   * Chromium: …
   * Gecko: …
   * WebKit: …
   * Deno (not for CORS changes): …
- [ ] [MDN issue](https://github.com/whatwg/meta/blob/main/MAINTAINERS.md#handling-pull-requests) is filed: …

(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/fetch/pull/1536


-- Commit Summary --

  * Update CSM destinations to CSP Level 3.

-- File Changes --

    M PULL_REQUEST_TEMPLATE.md (4)
    M fetch.bs (11)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1536.patch

https://github.com/whatwg/fetch/pull/1536.diff


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