release v3.13.0

[cspiel1]

Create/Prepare PRs for new Release (re/baresip)

• [x] Update CHANGELOG.md
  • Click Draft a new release on Release page
  • Fill a new release tag version and title (like v2.4.0)
  • Press Generate release notes
  • Save as draft (don't publish yet)
  • Copy release notes to CHANGELOG.md
• [x] Update debian/changelog
• [x] Check/Inc version numbers
  • CMakeLists.txt
  • include/baresip.h
  • mk/Doxyfile
• [x] Check ABI compatibility
  • CMakeLists.txt (Bump PROJECT_SOVERSION)
• [x] Comment out PRE Release identifier -dev
  • CMakeLists.txt
• [x] All tests green? [re, baresip]

Release

• [x] Merge PRs in this order
  • libre
  • baresip
• [x] Publish draft Releases (follow the same order)
  • Maybe Generate Release notes is needed to update (delete last notes first)

After Release

• [ ] Bump main branch versions with PRE Release identifier -dev
  • CMakeLists.txt
  • include/baresip.h (baresip only)

Release schedule

• ~v3.12.0 15. May (@alfredh)~
• v3.13.0 19. Jun (@cspiel1)
• v3.14.0 24. Jul (@sreimers)