KTOR-6221: Fix reduced concurrent reqs in Apache5 (#3738)

When using the Apache5 engine, total concurrent requests to a single
route were limited to 5 requests. This is due to the code which tried to
increase the concurrency to the ktor-standard 1000 concurrent having a
typo and setting the total max connections twice and missing the max
connections
completely.

ktor-client/ktor-client-apache5/jvm/src/io/ktor/client/engine/apache5/Apache5Engine.kt

@@ -92,7 +92,7 @@ internal class Apache5Engine(override val config: Apache5EngineConfig) : HttpCli
                 setConnectionManager(
                     PoolingAsyncClientConnectionManagerBuilder.create()
                         .setMaxConnTotal(MAX_CONNECTIONS_COUNT)
-                        .setMaxConnTotal(MAX_CONNECTIONS_COUNT)
+                        .setMaxConnPerRoute(MAX_CONNECTIONS_COUNT)
                         .setTlsStrategy(
                             ClientTlsStrategyBuilder.create()
                                 .setSslContext(config.sslContext ?: SSLContexts.createSystemDefault())