Flaky test-suite in the `NIO1ChannelSuite`

[danicheg]

==> X org.http4s.blaze.channel.NIO1ChannelSuite.Execute shutdown hooks  0.013s munit.ComparisonFailException: /home/runner/work/blaze/blaze/core/src/test/scala/org/http4s/blaze/channel/ChannelSuite.scala:75
74:      }
75:      _ <- assertFuture(Future(i.get), 1)
76:    } yield ()
values are not the same
=> Obtained
0
=> Diff (- obtained, + expected)
-0
+1

https://github.com/http4s/blaze/runs/4601644291?check_suite_focus=true#step:6:186

[danicheg]

This fired again

==> X org.http4s.blaze.channel.NIO1ChannelSuite.Execute shutdown hooks when one throws an exception  0.01s munit.ComparisonFailException: /home/runner/work/blaze/blaze/core/src/test/scala/org/http4s/blaze/channel/ChannelSuite.scala:93
92:      }
93:      _ <- assertFuture(Future(i.get), 2)
94:    } yield ()
values are not the same
=> Obtained
1
=> Diff (- obtained, + expected)
-1
+2