[roll] Roll fuchsia [bt][init] Define a core shard for #bluetooth-core

The #bluetooth-core realm contains Bluetooth packages for BT Core
functionality.

Define a core shard that mirrors the capability routes in core.cml where
the #bluetooth-core realm is currently defined. This will be unused
until it is explicitly added to the build via product assembly.

Original-Bug: 94055
Test: Core shard definition only, fx set with core_realm_shards and fx
build

Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/950754
Original-Revision: 7bef3e6065748f440a44fb4cd40d8359f6515252
GitOrigin-RevId: bdd5c0fd57106136ed47be7a811f86199d0ce501
Change-Id: I6726e6965d82e57d0e20a0c72c1b5b4039df2bc4
diff --git a/stem b/stem
index 207bc7e..ab9e615 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="d409aebeefdf6b1bafeb68ba854e3023b613f9c5"/>
+             revision="7bef3e6065748f440a44fb4cd40d8359f6515252"/>
   </projects>
   <hooks>
     <hook name="install-environment"