v2.6.2

This release includes the following improvements:

1. Support for GCC 12 (#2756)
2. Overload DataReader::get_unread_count (#2843)
3. Improve read/take performance when using topic with a great number of keys (#2848, #2854)
4. Improve rediscovery on lossy environments (#2858)

This release includes the following bugfixes:

1. Fixed several deadlocks and dataraces (#2771, #2818, #2791, #2774, #2840)
2. Fixed validation on ParameterPropertyList_t (#2855)
3. Fixed wrong usage of std::remove_if (#2861)
4. Fixed acknowledgement in DataSharing (#2860)
5. Other minor fixes (#2749, #2812, #2834, #2881)

PRs in merge order:
#2747, #2749, #2756, #2771, #2818, #2812, #2791, #2834, #2843, #2774, #2848, #2840, #2854, #2855, #2858, #2861, #2860, #2873, #2881