also remove sky130 from yaml, unsure if correct

Author: Fi50

conda-reqs/chipyard-extended.yaml

@@ -69,7 +69,7 @@ dependencies:
 
     # hammer packages
     - sty
-    - open_pdks.sky130a
+    # - open_pdks.sky130a
     - pip:
         - hammer-vlsi[asap7]==1.2.0