cmd: TestQuitQuitQuitGet failed

[flaky-bot]

This test failed!

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---

commit: 3e44db8
buildURL: https://github.com/GoogleCloudPlatform/alloydb-auth-proxy/actions/runs/12566285108
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 (3e44db8), this test passed in one build (https://github.com/GoogleCloudPlatform/alloydb-auth-proxy/actions/runs/12576618888) and failed in another build (https://github.com/GoogleCloudPlatform/alloydb-auth-proxy/actions/runs/12566285108).

[enocom]

=== RUN TestQuitQuitQuitGet
2025/01/01 02:29:57 [proj.region.clust.inst] Listening on 127.0.0.1:5432
2025/01/01 02:29:57 The proxy has started successfully and is ready for new connections!
2025/01/01 02:29:57 Enabling quitquitquit endpoint at localhost:9192
2025/01/01 02:29:57 The proxy has encountered a terminal error: failed to start HTTP server: listen tcp 127.0.0.1:9192: bind: Only one usage of each socket address (protocol/network address/port) is normally permitted.
root_test.go:1260: failed to dial endpoint: Get "http://localhost:9192/quitquitquit": dial tcp [::1]:9192: connectex: No connection could be made because the target machine actively refused it.
--- FAIL: TestQuitQuitQuitGet (11.03s)

[enocom]

Duplicate of #739.