test: Update microwatt antenna metric baseline

Update the sky130hd microwatt antenna violation guardrail observed in public head and merge CI after rebasing the branch on master.

The refreshed rule passes local checkMetadata validation against the public Jenkins head and merge metadata artifacts.

Signed-off-by: Jaehyun Kim <jhkim@precisioninno.com>

Author: jhkim-pii

flow/designs/sky130hd/microwatt/rules-base.json

@@ -82,7 +82,7 @@
         "compare": "<="
     },
     "detailedroute__antenna__violating__nets": {
-        "value": 0,
+        "value": 6,
         "compare": "<="
     },
     "detailedroute__antenna_diodes_count": {