Fix test containers metadata for --future-defaults

Author: vjovanov

metadata/org.testcontainers/testcontainers/1.17.6/reflect-config.json

@@ -66,6 +66,18 @@
     "name": "com.github.dockerjava.api.command.AsyncDockerCmd",
     "queryAllDeclaredMethods": true
   },
+  {
+    "condition": {
+      "typeReachable": "org.testcontainers.shaded.com.fasterxml.jackson.databind.ser.BeanPropertyWriter"
+    },
+    "name": "com.github.dockerjava.api.model.AuthConfig",
+    "methods": [
+      {
+        "name": "getUsername",
+        "parameterTypes": []
+      }
+    ]
+  },
   {
     "condition": {
       "typeReachable": "org.testcontainers.shaded.com.github.dockerjava.core.exec.CreateContainerCmdExec"