[24122] Fix warning on ubuntu noble (backport #133)

[mergify]

Description

This PR fixes:

../../eprosima/discovery-server/src/DiscoveryServerManager.cpp: In member function ‘void eprosima::discovery_server::DiscoveryServerManager::loadClient(tinyxml2::XMLElement*)’:
../../eprosima/discovery-server/src/DiscoveryServerManager.cpp:1106:28: error: suggest parentheses around assignment used as truth value [-Werror=parentheses]
 1106 |                     if (p4 = std::dynamic_pointer_cast<TCPv4TransportDescriptor>(sp))
      |                         ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

@Mergifyio backport 2.1.x 2.0.x 1.2.x

Contributor Checklist

• Commit messages follow the project guidelines.
• The added tests pass locally.
• Changes are backwards compatible.
• New feature has been documented/Current behavior is correctly described in the documentation.
• Applicable backports have been included in the description.

Reviewer Checklist

• The PR has a milestone assigned.
• The title and description correctly express the PR's purpose.
• Check contributor checklist is correct.
• Check CI results: changes do not issue any warning.
• Check CI results: failing tests are unrelated with the changes.

---

This is an automatic backport of pull request #133 done by [Mergify](https://mergify.com).