tests: flaky TestConnectionHandlerOpenUpdateClose

[oleg-jukovec]

2025-11-20T15:44:59.9010260Z === RUN   TestConnectionHandlerOpenUpdateClose
2025-11-20T15:44:59.9208910Z 2025/11/20 15:44:59 tarantool: connect to 127.0.0.1:3013 failed: failed to identify: read error: context canceled
2025-11-20T15:44:59.9312900Z     connection_pool_test.go:1138: 
2025-11-20T15:44:59.9564500Z         	Error Trace:	/Users/runner/work/go-tarantool/go-tarantool/tarantool/go-tarantool/pool/connection_pool_test.go:1138
2025-11-20T15:44:59.9567600Z         	Error:      	Expected nil, but got: &errors.errorString{s:"can't find rw instance in pool"}
2025-11-20T15:44:59.9676660Z         	Test:       	TestConnectionHandlerOpenUpdateClose
2025-11-20T15:44:59.9777130Z         	Messages:   	failed to make ro
2025-11-20T15:44:59.9879310Z --- FAIL: TestConnectionHandlerOpenUpdateClose (0.02s)
2025-11-20T15:44:59.9982560Z === RUN   TestConnectionHandlerOpenError