fix(sdk): final flake hotfix

Final hotfix for flakes, if this doesn't work then I'll dive into
figuring out the root cause. Now we wait 30 seconds and only continue if
we haven't seen a reorg for the full 30 seconds.

packages/sdk/tasks/deposit-erc20.ts

@@ -248,21 +248,21 @@ task('deposit-erc20', 'Deposits WETH9 onto L2.')
     await depositTx.wait()
     console.log(`ERC20 deposited - ${depositTx.hash}`)
 
-    // Deposit might get reorged, wait 10s and also log for reorgs.
+    // Deposit might get reorged, wait 30s and also log for reorgs.
     let prevBlockHash: string = ''
-    for (let i = 0; i < 10; i++) {
+    for (let i = 0; i < 30; i++) {
       const messageReceipt = await messenger.waitForMessageReceipt(depositTx)
       if (messageReceipt.receiptStatus !== 1) {
         throw new Error('deposit failed')
       }
 
-      if (
-        i > 0 &&
-        messageReceipt.transactionReceipt.blockHash !== prevBlockHash
-      ) {
+      if (messageReceipt.transactionReceipt.blockHash !== prevBlockHash) {
         console.log(
-          `Block number changed from ${prevBlockHash} to ${messageReceipt.transactionReceipt.blockHash}`
+          `Block hash changed from ${prevBlockHash} to ${messageReceipt.transactionReceipt.blockHash}`
         )
+
+        // Wait for stability, we want at least 30 seconds after any reorg
+        i = 0
       }
 
       prevBlockHash = messageReceipt.transactionReceipt.blockHash