mvnw script error on Mac OS

### Search before asking

- [x] I searched in the [issues](https://github.com/apache/fluss/issues) and found nothing similar.

### Fluss version

0.7.0 (latest release)

### Please describe the bug 🐞

shasum command on Mac OS requires - at the end of command
similar to the issue reported here https://issues.apache.org/jira/browse/FLINK-37181

### Solution

modify the mvnw script to correct the command

### Are you willing to submit a PR?

- [x] I'm willing to submit a PR!