functions/security: TestMakeGetRequest failed

[flaky-bot]

Note: #2047 was also for this test, but it was closed more than 10 days ago. So, I didn't mark it flaky.

---

commit: 21d5bca
buildURL: Build Status, Sponge
status: failed

Test output

    security_system_test.go:118: got Error: could not handle the request
        , want Success!

[codyoss]

This is the result of the function timing out. I believe this is a true flake caused by a backend issue. Closing for now but will add retries if this should happen again.