fix(kotlin-client): 🐛 replace accept-encoding application/json to null

- this header is not used for influx 2.0 server because it always send back CSV data
- this header blocks the accept-encoding gzip header from the BridgeInterceptor

client-kotlin/src/main/kotlin/com/influxdb/client/kotlin/internal/QueryKotlinApiImpl.kt

@@ -167,7 +167,7 @@ internal class QueryKotlinApiImpl(private val service: QueryService, private val
 
         val channel = Channel<String>()
 
-        val queryCall = service.postQueryResponseBody(null,  "application/json",
+        val queryCall = service.postQueryResponseBody(null,  null,
                 null, org, null, query)
 
         val consumer = BiConsumer { cancellable: Cancellable, line: String ->
@@ -194,7 +194,7 @@ internal class QueryKotlinApiImpl(private val service: QueryService, private val
 
         val channel = Channel<T>()
 
-        val queryCall = service.postQueryResponseBody(null, "application/json",
+        val queryCall = service.postQueryResponseBody(null, null,
                 null, org, null, query)
 
         val responseConsumer = object : FluxResponseConsumer {