feat(osaka): Update EIP-7939 - update CLZ gas cost (#1879)

Author: gurukamath

tests/osaka/eip7939_count_leading_zeros/spec.py

@@ -18,7 +18,7 @@ class ReferenceSpec:
 class Spec:
     """Constants and helpers for the CLZ opcode."""
 
-    CLZ_GAS_COST = 3
+    CLZ_GAS_COST = 5
 
     @classmethod
     def calculate_clz(cls, value: int) -> int:

tests/osaka/eip7939_count_leading_zeros/test_count_leading_zeros.py

@@ -116,7 +116,7 @@ def test_clz_gas_cost(state_test: StateTestFiller, pre: Alloc, fork: Fork):
             CodeGasMeasure(
                 code=Op.CLZ(Op.PUSH1(1)),
                 extra_stack_items=1,
-                overhead_cost=fork.gas_costs().G_VERY_LOW,
+                overhead_cost=fork.gas_costs().G_LOW,
             ),
         ),
         storage={"0x00": "0xdeadbeef"},