Use Apache Download Mirrors for Fluss binary downloads

[wuchong]

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Description

This Apache Download Mirrors link

https://www.apache.org/dyn/closer.lua/incubator/fluss/fluss-0.8.0-incubating/fluss-0.8.0-incubating-bin.tgz

is much faster than the default apache downloads link

https://downloads.apache.org/incubator/fluss/fluss-0.8.0-incubating/fluss-0.8.0-incubating-bin.tgz

We can update the binary and source tgz download link in https://fluss.apache.org/downloads/

Willingness to contribute

• I'm willing to submit a PR!