weechat/wee-slack: update submodule

diff --git a/weechat/python/wee-slack b/weechat/python/wee-slack
index 1655b26e8ade77ed56a6a94157a859aa69cfad26..8bd734c8e9a6b133a65548672f8a11ee3b3ce677 160000 (submodule)
--- a/weechat/python/wee-slack
+++ b/weechat/python/wee-slack
@@ -1 +1 @@
-Subproject commit 1655b26e8ade77ed56a6a94157a859aa69cfad26
+Subproject commit 8bd734c8e9a6b133a65548672f8a11ee3b3ce677