testing/libupnp: upgrade to 1.12.1
Upgrades libupnp to 1.12.1 and drops local patches which are no longer required for build.
We are currently working on getting Alpine Linux 3.21 out. This means that merge requests that are not aimed to help with that (only affecting testing, new aports) have a lower priority at the moment. Please be patient, they will be eventually picked up.
Upgrades libupnp to 1.12.1 and drops local patches which are no longer required for build.