[test] Skip memory-hungry test on Android

After allowing larger strings on 64-bit builds, this test OOMs on
Android devices that don't have enough memory.

Tbr: machenbach@chromium.org
Change-Id: I05c44d7074388a4306e5266ba1aa9da760c83377
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2035877
Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66089}

test/mjsunit/mjsunit.status

@@ -792,6 +792,7 @@
   # OOM:
   'regress/regress-752764': [FAIL],
   # Flaky OOM:
+  'regress/regress-748069': [SKIP],
   'regress/regress-779407': [SKIP],
   'regress/regress-852258': [SKIP],
 }],  # 'system == android'