[tests] Bump up the heap limit for the pause-on-oom test

Bug: v8:8521
Change-Id: I6e02930108ba90adf6d54aca319d2d2680964860
Reviewed-on: https://chromium-review.googlesource.com/c/1388543
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58464}

test/inspector/debugger/pause-on-oom.js

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// Flags: --max-old-space-size=8
+// Flags: --max-old-space-size=16
 
 let {session, contextGroup, Protocol} = InspectorTest.start('Check pause on OOM');