Remove changeset that only targets ignored packages (#1444)

The suspend-private-sandbox-deadlines changeset references only
@executor-js/runtime-dynamic-worker and @executor-js/runtime-deno-subprocess,
both in the changeset ignore list. changeset version never consumes an
ignored-only changeset, so the release workflow loops: it sees changesets,
versions nothing, and fails PR creation with 'No commits between main and
changeset-release/main', skipping npm publish. The change it described
already shipped in the runtime-quickjs 1.5.35 entry; the private runtimes
are unversioned.

Author: RhysSullivan