fix: update rpc on withdrawal migrationt tests #642

Job	Run time
prepare	3s
run-tests (EigenPod.t.sol)	1m 28s
run-tests (Delegation.t.sol)	1m 10s
run-tests (EigenLayerDeployer.t.sol)	1m 6s
run-tests (Pausable.t.sol)	1m 10s
run-tests (unit/EigenPod-PodManagerUnit.t.sol)	1m 7s
run-tests (unit/PauserRegistryUnit.t.sol)	1m 4s
run-tests (unit/StrategyBaseUnit.t.sol)	1m 12s
run-tests (unit/PausableUnit.t.sol)	1m 6s
run-tests (unit/DelegationUnit.t.sol)	1m 14s
run-tests (unit/EigenPodUnit.t.sol)	1m 8s
run-tests (unit/EigenPodManagerUnit.t.sol)	1m 10s
run-tests (unit/SlasherUnit.t.sol)	1m 15s
run-tests (unit/DelayedWithdrawalRouterUnit.t.sol)	1m 8s
run-tests (unit/StrategyManagerUnit.t.sol)	1m 11s
run-tests (DelegationFaucet.t.sol)	1m 7s
run-tests (Strategy.t.sol)	1m 10s
run-tests (integration/tests/Deposit_Delegate_Queue_Complete.t.sol)	1m 10s
run-tests (integration/User.t.sol)	1m 4s
run-tests (integration/IntegrationBase.t.sol)	1m 7s
run-tests (integration/mocks/BeaconChainMock.t.sol)	1m 7s
run-tests (integration/mocks/BeaconChainOracleMock.t.sol)	1m 4s
run-tests (integration/IntegrationDeployer.t.sol)	1m 7s
run-tests (integration/TimeMachine.t.sol)	1m 4s
run-tests (WithdrawalMigration.t.sol)	2m 53s
run-tests (DepositWithdraw.t.sol)	1m 6s
run-tests (Withdrawals.t.sol)	1m 7s
run-tests (EigenLayerTestHelper.t.sol)	1m 3s
run-tests (Slasher.t.sol)	1m 3s
	33m 44s

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