[commit: ghc] ghc-8.6: Bump stm submodule (be14113)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : ghc-8.6
Link       : http://ghc.haskell.org/trac/ghc/changeset/be14113c27174bb1580435ca635a78274bb17765/ghc

>---------------------------------------------------------------

commit be14113c27174bb1580435ca635a78274bb17765
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Wed Sep 19 14:56:41 2018 -0400

    Bump stm submodule


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be14113c27174bb1580435ca635a78274bb17765
 libraries/stm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/stm b/libraries/stm
index 5f4d7c6..d17acd2 160000
--- a/libraries/stm
+++ b/libraries/stm
@@ -1 +1 @@
-Subproject commit 5f4d7c6d07a760d935c9d96e62999f1ad38a5e43
+Subproject commit d17acd286344641da2748df1553aff5e4d1f6ebe