fix: Fix timer spurious calls (#1700)

Fixes #1634.
I also checked other timers and they don't have the issue.

src/util/Retry.cpp

@@ -57,10 +57,16 @@ Retry::Retry(RetryStrategyPtr strategy, boost::asio::strand<boost::asio::io_cont
 {
 }
 
+Retry::~Retry()
+{
+    *canceled_ = true;
+}
+
 void
 Retry::cancel()
 {
     timer_.cancel();
+    *canceled_ = true;
 }
 
 size_t