Update pip dependencies

Change-Id: I0f0597523f2c347e7145e4a953c87d6921604483
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>
diff --git a/requirements.txt b/requirements.txt
index 22189e5..f04a487 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -16,7 +16,7 @@
 #######################################################################################
 enum34==1.1.10
     # via pyangbind
-lxml==5.3.1
+lxml==5.4.0
     # via
     #   pyang
     #   pyangbind