[roll] Roll fuchsia [fint] Use test package_label for affected tests analysis.

See
https://ci.chromium.org/p/fuchsia/builders/try/core.x64-release/b8843419589700401552?
which has no affected tests versus
https://ci.chromium.org/p/fuchsia/builders/try/core.x64-release/b8843403749997599136?
which modified one of the same files as the CL the first builder ran on.
The second build has an affected AEMU shard with 21 tests.

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/548724
Original-Revision: 987e4d30e230dc916918f110d13ba6fc87d51908
GitOrigin-RevId: 274ae274f594b39601f0adf98139e35a7fe3b157
Change-Id: I7eb0941cfb512209a2f5b7d7922db567cea1985a
diff --git a/stem b/stem
index c408da6..de1181f 100644
--- a/stem
+++ b/stem
@@ -10,7 +10,7 @@
              githooks=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="ad39403e62911e4a422d83f7406407e1b160f40f"/>
+             revision="987e4d30e230dc916918f110d13ba6fc87d51908"/>
   </projects>
   <hooks>
     <hook name="install-environment"