[bisq-network/bisq] Fix memory leak caused by not cleaning up unused threads (#3734)

[Julian Knutsen]

With all that said, I did audit the code and it seems like a low-risk change. It is only called in the connection shutdown path and follows the exact same pattern as the `singleThreadExecutor` object. If there was so bug there it would likely already be found with the existing `shutDown()` code.

If the retesting effort isn't too much it is probably worth including so it doesn't have to wait until the January release.

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