Bump the timeouts in the dispatch_test

Ondřej Surý requested to merge 4392-increase-dispatch_test-timeouts into main

The client connection timeout was set to just one second, which might not be enough on busy systems (and the CI machines are oh-boy-busy). Bump the server timeouts to 10 seconds and client timeouts to 5 seconds, this will make the unit test run a little bit longer, but it should be more reliable.

Closes #4392 (closed)

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