Address flake in testNetworkCallbackMaximum am: 2eb2f7998d am: 23da14cf90 am: 09a1b8375e am: 9a1057e68f

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2730494

Change-Id: I57c3c08845a155af4b5fac2720ba3433e9ca48fa
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>