[roll] Roll fuchsia [starnix] Add perf_event_open example for a counting test

Original-Bug: 398915096

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1260409
Original-Revision: 5b020ebd69aad80e42be8ff57a08a12858817007
GitOrigin-RevId: 6d364263bd3db27d4cc13ac78da54edf3cb9112c
Change-Id: I272f443ccb2399d98f7f10247bb8f4088128f3a1

stem

diff --git a/stem b/stem
index 8c976ec..cdd81ef 100644
--- a/stem
+++ b/stem
@@ -8,7 +8,7 @@
              root=""
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="ce04535336ca07213eebbf23d9900c76011e4b89"
+             revision="5b020ebd69aad80e42be8ff57a08a12858817007"
              />
   </imports>
 </manifest>