[foozzie] Add --future to correctness-fuzzer configs

NOTRY=true

Change-Id: Ie96e645851beb26e9a777379ad68f1c173acd80d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1829266Reviewed-by: Clemens Backes [né Hammacher] <clemensb@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#64036}

tools/clusterfuzz/v8_fuzz_config.py

@@ -37,6 +37,7 @@ ADDITIONAL_FLAGS = [
   (0.01, '--thread-pool-size=4'),
   (0.01, '--thread-pool-size=8'),
   (0.1, '--interrupt-budget=1000'),
+  (0.25, '--future'),
 ]
 
 class Config(object):