[Turbo CQ] Increase number of shards for android_browsertests.

Increase shards on android-pie-arm64-rel to make P50 test runtime
under 15mins.

We should be able to allocate 1 more shard based on sailfish usage:
http://shortn/_QZTDxiAjXP

Bug: 1316565
Change-Id: I430e8e64cca17ec8daec676b91c8435c7313fce1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4289987
Reviewed-by: Haiyang Pan <[email protected]>
Commit-Queue: James Shen <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1109409}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 9306ebcd..839a6a0 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -71,7 +71,7 @@
               'device_type': 'sailfish',
             },
           ],
-          'shards': 3,
+          'shards': 4,
           'quickrun_shards': 6,
         },
       },