pkg alpine renamed malloc_test to misctest

[whosgonna]

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

Pre-Submission Checklist

• Commit message has the format required by CONTRIBUTING guide
• Commits are split per component (core, individual modules, libs, utils, ...)
• Each component has a single commit (if not, squash them into one commit)
• No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• Tested changes locally
• Related to issue FIX Building APKs fail due to rename of malloc_test module #3091

Description

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

[miconda]

Thanks!