This reverts commit dec192fd.

Reason for revert: broke gcc builds because of [[nodiscard]]

Original change's description:
> Roll inspector_protocol to 87e75896dcfcafda7869b0c9714db9b6cdc4c765
>
> This lets us accept spec-compliant CBOR tag for message envelopes.
>
> This also includes a change in v8-inspector-session-impl.cc that
> relaxes an envelope check to allow spec-compliant envelopes.
>
> Change-Id: Id77c1e0fc4b62d78e8580f81ef38d50e3eb54a1d
> Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3662540
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Commit-Queue: Andrey Kosyakov <caseq@chromium.org>
> Cr-Commit-Position: refs/heads/main@{#80761}

Change-Id: Iaa0cc65510c9af6391a2c7d0ef7baf903335a328
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3669468
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Auto-Submit: Andrey Kosyakov <caseq@chromium.org>
Cr-Commit-Position: refs/heads/main@{#80763}