component/bt: add 1 slot margin to program the 1st master Tx event during BLE connection

this will resolve the issue of failure of BLE connection stress test with sleep enabled

diff --git a/components/bt/lib b/components/bt/lib
index 2e3296c0ad97117bf9ce97e5f1330ec0077bfe4f..a92360b3230a39b3604d05cf56726e64d0624df6 160000 (submodule)
--- a/components/bt/lib
+++ b/components/bt/lib
@@ -1 +1 @@
-Subproject commit 2e3296c0ad97117bf9ce97e5f1330ec0077bfe4f
+Subproject commit a92360b3230a39b3604d05cf56726e64d0624df6