[RELEASE] Released version 2.4.12

Released version 2.4.12 with the following main changes :
    - BUG/MEDIUM: mworker: don't use _getsocks in wait mode
    - BUG/MAJOR: mux-h1: Don't decrement .curr_len for unsent data
diff --git a/VERSION b/VERSION
index 11e3212..cf95c01 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-2.4.11
+2.4.12