flaky streams map test

[marten-seemann]

Streams Map (outgoing) with stream ID limits queues a STREAMS_BLOCKED frame when there more streams waiting for OpenStreamSync than MAX_STREAMS allows
D:/a/quic-go/quic-go/streams_map_outgoing_test.go:382
  [FAILED] in [It] - D:/a/quic-go/quic-go/streams_map_outgoing_test.go:36 @ 01/29/24 04:28:59.542
+ [FAILED] [0.136 seconds]
Streams Map (outgoing) with stream ID limits [It] queues a STREAMS_BLOCKED frame when there more streams waiting for OpenStreamSync than MAX_STREAMS allows
D:/a/quic-go/quic-go/streams_map_outgoing_test.go:382

  [FAILED] Timed out after 0.059s.
  Expected
      <int>: 1
  to equal
      <int>: 2
  In [It] at: D:/a/quic-go/quic-go/streams_map_outgoing_test.go:36 @ 01/29/24 04:28:59.542

  Full Stack Trace
    github.com/quic-go/quic-go.init.func33.1(0x2)
    	D:/a/quic-go/quic-go/streams_map_outgoing_test.go:36 +0x145
    github.com/quic-go/quic-go.init.func33.4.13()
    	D:/a/quic-go/quic-go/streams_map_outgoing_test.go:399 +0x162