contrib/miekg/dns: use random port for test #2024

Job	Run time
Verify generated files are up-to-date	2m 59s
Go Versions Matrix	12s
Integration Test (ubuntu \| oldstable \| DRIVER)	3m 54s
Integration Test (ubuntu \| stable \| DRIVER)	3m 34s
Integration Test (ubuntu \| 1.24.0-rc.3 \| DRIVER)	3m 49s
Integration Test (macos \| oldstable \| DRIVER)	2m 32s
Integration Test (macos \| stable \| DRIVER)	3m 21s
Integration Test (macos \| 1.24.0-rc.3 \| DRIVER)	3m 8s
Integration Test (windows \| oldstable \| DRIVER)	9m 44s
Integration Test (windows \| stable \| DRIVER)	10m 59s
Integration Test (windows \| 1.24.0-rc.3 \| DRIVER)	5m 56s
Integration Test (ubuntu \| oldstable \| TOOLEXEC)	3m 39s
Integration Test (ubuntu \| oldstable \| GOFLAGS)	3m 55s
Orchestrion Integration Tests	1s
	57m 43s

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