SocketAppenderReconnectTest still flaky on mac 11.8.1; raising timeout to 15 sec helps

[Dan Kegel]

My build procedure for the release-2.x branch succeeded on mac
10.16.7, but is failing one lousy test on mac 11.8.1:

SocketAppenderReconnectTest.reconnect_should_fallback_when_there_are_multiple_resolved_hosts:129->verifyLoggingSuccess:192->awaitUntilSucceeds:219
» ConditionTimeout

I think https://github.com/apache/logging-log4j2/commit/b3e8818a111d884d1fbfe
wasn't sufficient.
Going with the same timeout as on windows seemed to work, i.e.

--- 
a/log4j-core/src/test/java/org/apache/logging/log4j/core/net/SocketAppenderReconnectTest.java
+++ 
b/log4j-core/src/test/java/org/apache/logging/log4j/core/net/SocketAppenderReconnectTest.java
@@ -211,7 +211,7 @@ class SocketAppenderReconnectTest {
         } else {
             // Universally sensible values.
             pollIntervalMillis = 1000;
-            timeoutSeconds = 3;
+            timeoutSeconds = 15;
         }
         await()
                 .pollInterval(pollIntervalMillis, TimeUnit.MILLISECONDS)

There's something about even nice fast corporate hex-core i7 macbooks
that is slow these days, I dunno.
- Dan