FIX #3091 Building APKs fail due to rename of malloc_test module

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#### Description Refactored reference to `malloc_test` in `pkg/kamailio/alpine/APKBUILDER` to `misctest` due to module rename.

You can view, comment on, or merge this pull request online at:

https://github.com/kamailio/kamailio/pull/3093

-- Commit Summary --

* pkg alpine renamed malloc_test to misctest

-- File Changes --

M pkg/kamailio/alpine/APKBUILD (2)

-- Patch Links --

https://github.com/kamailio/kamailio/pull/3093.patch https://github.com/kamailio/kamailio/pull/3093.diff