Merge pull request #3 from chipfoundry/change-pdk

Update pdk to point to sky130B

Author: jdicorpo

Makefile

@@ -55,7 +55,7 @@ MPW_TAG ?= 2024.09.12-1
 PYTHON_BIN ?= python3
 
 # PDK switch varient
-export PDK?=sky130A
+export PDK?=sky130B
 
 # Install lite version of caravel, (1): caravel-lite, (0): caravel
 MCW_LITE?=1