remove potential error when setting exit code (#640)

* remove potential error setting exit code

this commit implements a more reliable way of setting the CLI's exit code in error cases.

Previously, I encountered this error when running the cli:
```console
$ cordova build
TypeError [ERR_INVALID_ARG_TYPE]: The "code" argument must be of type number. Received type string ('ERR_UNHANDLED_ERROR')
    at process.set [as exitCode] (node:internal/bootstrap/node:123:9)
    at /opt/nodejs/lib/node_modules/cordova/bin/cordova:33:22
```

With this version, I get to see the root problem:
```console
$ cordova build
Unhandled error. ('Parsing /home/me/hello/config.xml failed')
```

* Update cordova

bin/cordova

@@ -29,7 +29,11 @@ cli(process.argv).catch(err => {
         const errorOutput = typeof err === 'string' ? err : util.inspect(err);
         throw new CordovaError('Promise rejected with non-error: ' + errorOutput);
     }
-    process.exitCode = err.code || 1;
+    if (typeof err.code !== 'number') {
+        process.exitCode = 1;
+    } else {
+        process.exitCode = err.code;
+    }
 
     // We cannot emit an error event here, as that would cause another error
     console.error(err.message);