software/erp5: fix schemas allowing additional properties

In 55449aca (software/erp5: describe the allowed formats for family
and frontend names, 2024-01-01) we changed to a stricter definition of
zope and frontends partitions names, but because these objects allowed
additional properties, a partition not matching the pattern would be
anyway be accepted.

software/erp5/instance-erp5-input-schema.json

@@ -213,6 +213,7 @@
           "type": "object"
         }
       },
+      "additionalProperties": false,
       "type": "object"
     },
     "zope-partition-dict": {
@@ -285,6 +286,7 @@
           "type": "object"
         }
       },
+      "additionalProperties": false,
       "type": "object"
     },
     "kumofs": {