Increase shards for tests timing out

Bug: v8:12748
Change-Id: I7c4db798728a6ed243ac7aace3af45bf32367dc5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3560479Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Liviu Rau <liviurau@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79678}

infra/testing/builders.pyl

@@ -281,9 +281,9 @@
     },
     'tests': [
       {'name': 'mjsunit_sp_frame_access'},
-      {'name': 'mozilla'},
+      {'name': 'mozilla', 'shards': 2},
       {'name': 'test262', 'variant': 'default', 'shards': 2},
-      {'name': 'v8testing', 'shards': 7},
+      {'name': 'v8testing', 'shards': 8},
       {'name': 'v8testing', 'variant': 'extra', 'shards': 7},
     ],
   },
@@ -592,7 +592,7 @@
       'os': 'Ubuntu-18.04',
     },
     'tests': [
-      {'name': 'mjsunit_sp_frame_access'},
+      {'name': 'mjsunit_sp_frame_access', 'shards': 2},
       {'name': 'mozilla', 'shards': 4},
       {'name': 'test262', 'variant': 'default', 'shards': 4},
       {'name': 'v8testing', 'shards': 14},