Backport(v1.16) ci: fix unstable test (#4820) #4821
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**Which issue(s) this PR fixes**: None. **What this PR does / why we need it**: Fix unstable test. ``` Error: test: creates a udp server to read and write data using IPv6(ServerPluginHelperTest::#server_create_udp): Errno::EADDRINUSE: Address already in use - bind(2) for "::1" port 8859 /home/runner/work/fluentd/fluentd/test/plugin_helper/test_server.rb:697:in 'UDPSocket#bind' /home/runner/work/fluentd/fluentd/test/plugin_helper/test_server.rb:697:in 'block (3 levels) in <class:ServerPluginHelperTest>' <internal:numeric>:257:in 'Integer#times' /home/runner/work/fluentd/fluentd/test/plugin_helper/test_server.rb:694:in 'block (2 levels) in <class:ServerPluginHelperTest>' ``` **Docs Changes**: Not needed. **Release Note**: The same as the title. Signed-off-by: Daijiro Fukuda <fukuda@clear-code.com>
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Which issue(s) this PR fixes:
What this PR does / why we need it:
Fix unstable test.
Docs Changes:
Not needed.
Release Note:
The same as the title.