fix lgtm alerts

sentry-core/src/main/java/io/sentry/core/transport/HttpTransport.java

@@ -98,8 +98,9 @@ public TransportResult send(SentryEvent event) throws IOException {
 
     connection.connect();
 
-    try (OutputStream outputStream = connection.getOutputStream()) {
-      serializer.serialize(event, new OutputStreamWriter(outputStream, UTF_8));
+    try (OutputStream outputStream = connection.getOutputStream();
+        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(outputStream, UTF_8)) {
+      serializer.serialize(event, outputStreamWriter);
 
       // need to also close the input stream of the connection
       connection.getInputStream().close();

sentry-core/src/main/java/io/sentry/core/transport/IBackOffIntervalStrategy.java

@@ -15,5 +15,5 @@ public interface IBackOffIntervalStrategy {
    * @param attempt the number of attempts made so far
    * @return the suggested delay in milliseconds
    */
-  long nextDelayMillis(int attempt);
+  long nextDelayMillis(long attempt);
 }