…s after topic unloading (#473)

(cherry picked from commit afeac78)

(cherry picked from commit d3fd6b2)

…481)

This was introduced in v3.7.0 via #447, which contained a change that attempted to fix an issue where a pre-mature ack of a message before a multi-topic subscriber was ready could have caused a crash.  To fix the original bug, all multi-topic subscriptions are started with their message listener paused. They later get un-paused once all topics are successfully subscribed and connected.  However, on a regex subscription when new topics are discovered, they also start in a paused state, and there's no mechanism to resume them.  Hence, they get stuck, and no messages for new topics will be processed.

This change adds a call to resume any new listeners after new topics are added.

(cherry picked from commit 0a9b7d9)

Fixes #479

### Motivation

The current keepalive logic is too lenient – merely receiving ping commands can keep the connection alive.

### Modifications

Ignore ping command in connection keepalive logic.

(cherry picked from commit f37bf92)

- openssl 3.1.4 -> 3.5.0
- zlib 1.3 -> 1.3.1
- curl 8.4.0 -> 8.13.0

Keep the `protobuf` to an old version (3.21.12) because it's the last release that supports C++11, see https://protobuf.dev/news/2022-08-03/

Keep the `asio` version not changed (1.28.2) because there are some APIs removed.

(cherry picked from commit eede80b)

(cherry picked from commit 6aeb381)

(cherry picked from commit 0e1ed3b)

(cherry picked from commit d9dd029)