internal/proxy: TestRunConnectionCheck failed

[flaky-bot]

This test failed!

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If I'm commenting on this issue too often, add the flakybot: quiet label and
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---

commit: 1981c49
buildURL: https://github.com/GoogleCloudPlatform/alloydb-auth-proxy/actions/runs/11734913053
status: failed

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

---

When run at the same commit (1981c49), this test passed in one build (https://github.com/GoogleCloudPlatform/alloydb-auth-proxy/actions/runs/11752466726) and failed in another build (https://github.com/GoogleCloudPlatform/alloydb-auth-proxy/actions/runs/11734913053).

[enocom]

Windows unit tests failed with:

=== RUN TestRunConnectionCheck
proxy_test.go:693: proxy.NewClient error: [proj.region.clust.inst1] Unable to mount socket: listen tcp 127.0.0.1:50002: bind: An attempt was made to access a socket in a way forbidden by its access permissions.
--- FAIL: TestRunConnectionCheck (0.00s)

This probably means the port was in use when the test tried to run.