[w3c/IndexedDB] "Convert a value to a key" should return invalid for detached array buffers (PR #440)

Closes #417 by updating ["7.4 Convert a value to a key"](https://www.w3.org/TR/IndexedDB/#convert-value-to-key) to return invalid when the `input` buffer source is detached.

The following tasks have been completed:

 * [X] Confirmed there are no ReSpec/BikeShed errors or warnings.
 * [X] Modified Web platform tests (https://chromium-review.googlesource.com/c/chromium/src/+/6303007)

Implementation commitment:

 * [ ] WebKit (https://bugs.webkit.org/show_bug.cgi?id=)
 * [X] Chromium (https://bugs.chromium.org/p/chromium/issues/detail?id=)
 * [X] Gecko (https://bugzilla.mozilla.org/show_bug.cgi?id=)


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  https://github.com/w3c/IndexedDB/pull/440

-- Commit Summary --

  * Initial commit

-- File Changes --

    M index.bs (13600)

-- Patch Links --

https://github.com/w3c/IndexedDB/pull/440.patch
https://github.com/w3c/IndexedDB/pull/440.diff

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