weechat: update wee-slack submodule

diff --git a/weechat/python/wee-slack b/weechat/python/wee-slack
index c70db4e01e2cbab2a586b7f9bf72feaaa2991a60..1bc423a87baf4f2eede8974cd7a2f3f6b29aaebf 160000 (submodule)
--- a/weechat/python/wee-slack
+++ b/weechat/python/wee-slack
@@ -1 +1 @@
-Subproject commit c70db4e01e2cbab2a586b7f9bf72feaaa2991a60
+Subproject commit 1bc423a87baf4f2eede8974cd7a2f3f6b29aaebf