update osm2pgsql (custom style)

diff --git a/osm2pgsql b/osm2pgsql
index 433ad388b88d74235e9fc4dd12fa608719b32904..56c8f56b43e1464361d535eeb61e2335d1d983e4 160000 (submodule)
--- a/osm2pgsql
+++ b/osm2pgsql
@@ -1 +1 @@
-Subproject commit 433ad388b88d74235e9fc4dd12fa608719b32904
+Subproject commit 56c8f56b43e1464361d535eeb61e2335d1d983e4