Use msg! in program entrypoint (bp #13889)

[mergify]

This is an automated backport of pull request #13889 done by Mergify

Cherry-pick of 57dd60f has failed:

On branch mergify/bp/v1.4/pr-13889
Your branch is up to date with 'origin/v1.4'.

You are currently cherry-picking commit 57dd60f67.
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Unmerged paths:
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	both modified:   sdk/program/src/entrypoint.rs

no changes added to commit (use "git add" and/or "git commit -a")

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[mergify]

automerge label removed due to a CI failure

[codecov]

Codecov Report

Merging #13891 (57dd60f) into v1.4 (446e02b) will decrease coverage by 0.0%.
The diff coverage is 69.9%.

@@           Coverage Diff            @@
##            v1.4   #13891     +/-   ##
========================================
- Coverage   82.1%    82.0%   -0.1%     
========================================
  Files        382      382             
  Lines      92746    93398    +652     
========================================
+ Hits       76218    76678    +460     
- Misses     16528    16720    +192     

[jackcmay]

Already backported via #14001