Update requirements-dev to point to branch and refresh updates

Change-Id: I14a23228e5dc4fc9fa37afe157aaca2a0c537359
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/requirements-dev.txt b/requirements-dev.txt
index f2e970f..c84d1bc 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -27,7 +27,7 @@
     #   -r https://osm.etsi.org/gitweb/?p=osm/IM.git;a=blob_plain;f=requirements.txt;hb=master
     #   pyang
     #   pyangbind
-osm-im @ git+https://osm.etsi.org/gerrit/osm/IM.git@master
+osm-im @ git+https://osm.etsi.org/gerrit/osm/IM.git@v14.0
     # via -r requirements-dev.in
 pyang==2.5.3
     # via