update eip7918

Author: souradeep-das

src/ethereum/osaka/vm/gas.py

@@ -71,7 +71,7 @@
 GAS_POINT_EVALUATION = Uint(50000)
 
 TARGET_BLOB_GAS_PER_BLOCK = U64(786432)
-BLOB_BASE_COST = Uint(2**14)
+BLOB_BASE_COST = Uint(2**13)
 BLOB_SCHEDULE_MAX = U64(9)
 BLOB_SCHEDULE_TARGET = U64(6)
 GAS_PER_BLOB = U64(2**17)