[roll] Roll fuchsia [build][tests] Move hermetic tests under //examples to //examples:hermetic_tests

This establishes the tree of ':hermetic_tests' and ':host_tests' for
the //examples section of the source tree.  This is enforced via
the 'validated_test_types_group()' GN template.

Original-Bug: b/298458500
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/910821
Original-Revision: b1b3bf20e6282014673fe124f650c2e221c50ff6
GitOrigin-RevId: 3d871b361adf271727dd920bd69d1b5b3d38a956
Change-Id: Ia5930269d7f8be957770d08c32f458ea58b619b1
diff --git a/stem b/stem
index e5b6c87..599af38 100644
--- a/stem
+++ b/stem
@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="075d28d5b17ffc9f91e46c49ed2ba13f4961ecd5"/>
+             revision="b1b3bf20e6282014673fe124f650c2e221c50ff6"/>
   </projects>
   <hooks>
     <hook name="install-environment"