[releng] correct release update-site version

Signed-off-by: Ansgar Radermacher <ansgar.radermacher@cea.fr>
Change-Id: I94858bbb84e12ef3659b363bad3a1faceebdb2f4
diff --git a/releng/org.eclipse.papyrus.designer.product/p2.inf b/releng/org.eclipse.papyrus.designer.product/p2.inf
index 75c87aa..f72ba4d 100644
--- a/releng/org.eclipse.papyrus.designer.product/p2.inf
+++ b/releng/org.eclipse.papyrus.designer.product/p2.inf
@@ -1,6 +1,6 @@
 instructions.configure=\
-  addRepository(type:0,location:https${#58}//download.eclipse.org/releases/2021-03,name:2021-03);\
-  addRepository(type:1,location:https${#58}//download.eclipse.org/releases/2021-03,name:2021-03);\
+  addRepository(type:0,location:https${#58}//download.eclipse.org/releases/2021-12,name:2021-12);\
+  addRepository(type:1,location:https${#58}//download.eclipse.org/releases/2021-12,name:2021-12);\
   addRepository(type:0,location:https${#58}//download.eclipse.org/modeling/mdt/papyrus/components/designer,name:Papyrus SW designer release);\
   addRepository(type:1,location:https${#58}//download.eclipse.org/modeling/mdt/papyrus/components/designer,name:Papyrus SW designer release);\
   addRepository(type:0,location:https${#58}//download.eclipse.org/modeling/mdt/papyrus/components/marte,name:MARTE);\