codec2: update to 1.0.3.

[unspecd]

Testing the changes

• I tested the changes in this PR: briefly

Local build testing

• I built this PR locally for my native architecture, x86_64-musl
• I built this PR locally for these architectures (if supported. mark crossbuilds):
  • ppc64le-musl

[Chocimier]

No need to make it extended or check for full check mode.
It's a bit surprising that pulling so much as checkdepends don't affect resulting package, but that's how it is. 👌🏻

[github-actions]

Pull Requests become stale 90 days after last activity and are closed 14 days after that. If this pull request is still relevant bump it or assign it.