Flaky test: TestPeerPoolCacheEthV5

[igor-sirotin]

This one seem to be around for a long time:

• Consistently flaky Jenkins unit tests #1978 (comment)

Stacktrace
=== RUN   TestPeerPoolSimulationSuite/TestPeerPoolCacheEthV5
panic: runtime error: invalid memory address or nil pointer dereference [recovered]
	panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0xbe0939]
goroutine 364 [running]:
github.com/status-im/status-go/common.LogOnPanic()
	/home/jenkins/workspace/status-go_prs_tests_PR-6205/common/utils.go:104 +0x28d
panic({0xe81200?, 0x18272b0?})
	/nix/store/mf08k94zrnzb2q8x303g14l2ryi2ws3w-go-1.21.10/share/go/src/runtime/panic.go:914 +0x21f
github.com/ethereum/go-ethereum/p2p/discv5.(*Network).SearchTopic(...)
	/home/jenkins/workspace/status-go_prs_tests_PR-6205/vendor/github.com/ethereum/go-ethereum/p2p/discv5/net.go:294
github.com/status-im/status-go/discovery.(*DiscV5).Discover(0x0?, {0xfab0da, 0x8}, 0xc0002aa930, 0xc000409620, 0xc0002aa9a0)
	/home/jenkins/workspace/status-go_prs_tests_PR-6205/discovery/discv5.go:87 +0x99
github.com/status-im/status-go/peers.(*TopicPool).StartSearch.func1()
	/home/jenkins/workspace/status-go_prs_tests_PR-6205/peers/topicpool.go:449 +0x7e
created by github.com/status-im/status-go/peers.(*TopicPool).StartSearch in goroutine 113
	/home/jenkins/workspace/status-go_prs_tests_PR-6205/peers/topicpool.go:447 +0x46b