Update antenna metrics for ./designs/ihp-sg13g2/riscv32i

| Metric                                        | Old      | New      | Type     |
| ------                                        | ---      | ---      | ----     |
| detailedroute__antenna__violating__nets       |       21 |       30 | Failing  |

Signed-off-by: Matt Liberty <[email protected]>

Author: maliberty

flow/designs/ihp-sg13g2/riscv32i/rules-base.json

@@ -40,7 +40,7 @@
         "compare": "<="
     },
     "detailedroute__antenna__violating__nets": {
-        "value": 21,
+        "value": 30,
         "compare": "<="
     },
     "detailedroute__antenna_diodes_count": {