Flaky `JettyServerSuite`

[danicheg]

==> X org.http4s.jetty.server.JettyServerSuite.ChannelOptions should route requests on the service executor  8.35s java.io.IOException: Server returned HTTP response code: 500 for URL: http://127.0.0.1:40987/thread/routing
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1897)
    at sun.net.www.protocol.http.HttpURLConnection.access$200(HttpURLConnection.java:92)
    at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1487)
    at sun.net.www.protocol.http.HttpURLConnection$9.run(HttpURLConnection.java:1485)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessController.doPrivilegedWithCombiner(AccessController.java:784)
    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1484)
    at java.net.URL.openStream(URL.java:1093)
    at scala.io.Source$.fromURL(Source.scala:144)
    at org.http4s.jetty.server.JettyServerSuite.$anonfun$get$1(JettyServerSuite.scala:69)
    at blocking @ org.http4s.jetty.server.JettyServerSuite.get(JettyServerSuite.scala:71)
    at map @ org.http4s.jetty.server.JettyServerSuite.$anonfun$new$1(JettyServerSuite.scala:86)
    at flatMap @ munit.CatsEffectAssertions.assertIO(CatsEffectAssertions.scala:52)

https://github.com/http4s/http4s/runs/4141739369?check_suite_focus=true