add .copy() where needed in tests

Author: fradamt

tests/core/pyspec/eth2spec/test/electra/block_processing/test_process_execution_layer_withdrawal_request.py

@@ -774,7 +774,7 @@ def run_execution_layer_withdrawal_request_processing(
     pre_pending_partial_withdrawals = state.pending_partial_withdrawals.copy()
     pre_balance = state.balances[validator_index]
     pre_effective_balance = state.validators[validator_index].effective_balance
-    pre_state = state
+    pre_state = state.copy()
     expected_amount_to_withdraw = compute_amount_to_withdraw(
         spec, state, validator_index, execution_layer_withdrawal_request.amount
     )

tests/core/pyspec/eth2spec/test/electra/epoch_processing/test_process_pending_balance_deposits.py

@@ -95,7 +95,7 @@ def test_multiple_pending_deposits_below_churn(spec, state):
     state.pending_balance_deposits.append(
         spec.PendingBalanceDeposit(index=1, amount=amount)
     )
-    pre_balances = state.balances
+    pre_balances = state.balances.copy()
     yield from run_epoch_processing_with(
         spec, state, "process_pending_balance_deposits"
     )
@@ -115,7 +115,7 @@ def test_multiple_pending_deposits_above_churn(spec, state):
         state.pending_balance_deposits.append(
             spec.PendingBalanceDeposit(index=i, amount=amount)
         )
-    pre_balances = state.balances
+    pre_balances = state.balances.copy()
     yield from run_epoch_processing_with(
         spec, state, "process_pending_balance_deposits"
     )