[ic] Add leszeks to src/ic/OWNERS

Change-Id: I0c11c0ba51af8e1e1c66ca6cf7e351b54464fd2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3879226Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83034}

src/ic/OWNERS

 ishell@chromium.org
 jkummerow@chromium.org
+leszeks@chromium.org
 verwaest@chromium.org