Revert "Bump Go version to 1.23.6 (#30242)" (#30359)

This reverts commit acbbd4c58d.

server/public/pluginapi/experimental/bot/logger/test_logger.go

@@ -52,7 +52,7 @@ func (l *testLogger) logf(prefix, format string, args ...interface{}) {
 		measure(l.logContext)
 		out += fmt.Sprintf(" -- %+v", l.logContext)
 	}
-	l.TB.Log(out)
+	l.TB.Logf(out)
 }
 
 func (l *testLogger) Debugf(format string, args ...interface{}) { l.logf("DEBUG", format, args...) }