chore(test): wait for server in upgrade test (matter-labs#1784)

## What ❔

- Waits more for server to start in upgrade test. 
- Fixes typo in `core/lib/zksync_core/Cargo.toml`

## Why ❔

Test is flaky in its current form

## Checklist

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<!-- For draft PRs check the boxes as you complete them. -->

- [ ] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [ ] Code has been formatted via `zk fmt` and `zk lint`.
- [ ] Spellcheck has been run via `zk spellcheck`.
- [ ] Linkcheck has been run via `zk linkcheck`.

core/lib/zksync_core/Cargo.toml

@@ -102,7 +102,7 @@ jsonrpsee.workspace = true
 tempfile.workspace = true
 test-casing.workspace = true
 test-log.workspace = true
-backon.workspsace = true
+backon.workspace = true
 
 [build-dependencies]
 zksync_protobuf_build.workspace = true

core/tests/upgrade-test/tests/upgrade.test.ts

@@ -277,14 +277,14 @@ describe('Upgrade test', function () {
     step('Execute transactions after simple restart', async () => {
         // Stop server.
         await utils.exec('pkill zksync_server');
-        await utils.sleep(5);
+        await utils.sleep(10);
 
         // Run again.
         utils.background(
             'cd $ZKSYNC_HOME && zk f cargo run --bin zksync_server --release -- --components=api,tree,eth,state_keeper,commitment_generator &> upgrade.log',
             [null, logs, logs]
         );
-        await utils.sleep(5);
+        await utils.sleep(10);
 
         // Trying to send a transaction from the same address again
         await checkedRandomTransfer(alice, BigNumber.from(1));