Update version to 11.2.0-rc1

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
diff --git a/VERSION b/VERSION
index 96cb839..94ba9ae 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-11.2.0-devel
+11.2.0-rc1