Maybe retry on TlsAlertCloseNotify error

This might not be specific to network notification, but the issue happens all
the time testing scenarios that rely on network notification, so it's hard
to ignore.

src/http/client.zig

@@ -895,6 +895,10 @@ fn AsyncHandler(comptime H: type, comptime L: type) type {
             }
 
             const status = self.conn.received(self.read_buf[0 .. self.read_pos + n]) catch |err| {
+                if (err == error.TlsAlertCloseNotify and self.state == .handshake and self.maybeRetryRequest()) {
+                    return;
+                }
+
                 self.handleError("data processing", err);
                 return;
             };