Update bytestring submodule

This pulls in - https://github.com/haskell/bytestring/pull/40 (which is related to #9992) - https://github.com/haskell/bytestring/pull/38 (cherry picked from commit ff4733f4)

Update bytestring submodule
9db49eab · Herbert Valerio Riedel · 194f1b56 · 08d5c3a8 · fa7e1cc9 · 08d5c3a8
Commit 9db49eab authored 10 years ago by Herbert Valerio Riedel
--- a/bytestring @ 08d5c3a8
+++ b/bytestring @ 08d5c3a8
-Subproject commit fa7e1cc94982c0da85a022a501eadb1b347ea60c
+Subproject commit 08d5c3a80be94a9d7ef7731317dea79aaadbd2c4