circuitv2: flaky TestReservationFailures

[marten-seemann]

https://github.com/libp2p/go-libp2p/actions/runs/3092616835/jobs/5004089751

  === RUN   TestReservationFailures/unsupported_protocol
      reservation_test.go:100: 
          	Error Trace:	D:\a\go-libp2p\go-libp2p\p2p\protocol\circuitv2\client\reservation_test.go:100
          	Error:      	"Application error 0x0: peer:12D3KooWKfsfaScKKyfhMAsdiRPKqDiK7TYWf5Lq8EmLXKELS67X: cannot reserve inbound connection: resource limit exceeded" does not contain "protocol not supported"
          	Test:       	TestReservationFailures/unsupported_protocol