devel/heaptrack: update to 1.3.0, latest upstream

Heaptrack traces all memory allocations and annotates these events with
stack traces. Dedicated analysis tools then allow you to interpret the
heap memory profile to, e.g., find hotspots that need to be optimized
to reduce the memory footprint of your application.

Release notes are here:
https://invent.kde.org/sdk/heaptrack/-/releases/v1.3.0

Version 1.3.0 comes with quite some important new features, notably
time based filtering capabilities and support for custom suppressions.