screenshot plugin: fix okhttp resource leak on imgur upload

runelite-client/src/main/java/net/runelite/client/plugins/screenshot/ScreenshotPlugin.java

@@ -422,7 +422,8 @@ public class ScreenshotPlugin extends Plugin
 			@Override
 			public void onResponse(Call call, Response response) throws IOException
 			{
-				InputStream in = response.body().byteStream();
+				try (InputStream in = response.body().byteStream())
+				{
 					ImageUploadResponse imageUploadResponse = RuneLiteAPI.GSON
 							.fromJson(new InputStreamReader(in), ImageUploadResponse.class);
 
@@ -440,6 +441,7 @@ public class ScreenshotPlugin extends Plugin
 						}
 					}
 				}
+			}
 		});
 	}