[interpreter] Add more owners

.. to increase bus factor in EU time zones.

Change-Id: I7f1bca0fd765f8f1720ff5534823b4daaa290ea3
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3879488
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83049}

src/interpreter/OWNERS

+cbruni@chromium.org
+ishell@chromium.org
+jgruber@chromium.org
 leszeks@chromium.org
 syg@chromium.org