Upgrade oppulance to 2.0-rc2 (fixes build issue with modern bison)

packages/oppulance/package.py

@@ -21,8 +21,8 @@ class Oppulance(Package):
 
     releases = [
         {
-            'version': '2.0-rc1',
-            'tag': 'ebrains_release-2-rc1'
+            'version': '2.0-rc2',
+            'tag': 'ebrains_release-2-rc2'
         },
     ]