Bump exec-maven-plugin to 3.1.0 in fluss-dist.

[loserwang1024]

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Description

Currently, version of exec-maven-plugin in root pom.xml is 3.1.0, while version in fluss-dist is still 1.5.0.

[INFO] --- exec:1.5.0:exec (create-build-target-link) @ fluss-dist ---
[ERROR] Command execution failed.
java.io.IOException: Stream closed
at java.lang.ProcessBuilder$NullOutputStream.write (ProcessBuilder.java:442)
at java.io.OutputStream.write (OutputStream.java:157)
at java.io.BufferedOutputStream.flushBuffer (BufferedOutputStream.java:81)
at java.io.BufferedOutputStream.flush (BufferedOutputStream.java:142)
at java.io.FilterOutputStream.close (FilterOutputStream.java:182)

Willingness to contribute

• I'm willing to submit a PR!