Bumped shards for V8 Mac - arm64 - sim - debug

Bug: chromium:1279426
Change-Id: If7c1c96d4637a6d2c2fe20bf6aac921ad9b81490
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3341513Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Alexander Schulze <alexschulze@chromium.org>
Auto-Submit: Alexander Schulze <alexschulze@chromium.org>
Cr-Commit-Position: refs/heads/main@{#78395}

infra/testing/builders.pyl

@@ -1575,8 +1575,8 @@
       'priority': 35,
     },
     'tests': [
-      {'name': 'v8testing', 'shards': 8},
-      {'name': 'v8testing', 'variant': 'future', 'shards': 2},
+      {'name': 'v8testing', 'shards': 14},
+      {'name': 'v8testing', 'variant': 'future', 'shards': 4},
     ],
   },
   'V8 Mac - arm64 - sim - release': {