💚 Fix publishing and dry-run

[AlexV525]

https://github.com/cfug/dio/actions/runs/6269363038/job/17025684902

Run [[ dart pub publish --dry-run  ]] in dio
Error: Package validation found the following potential issue:
* Rename the top-level "docs" directory to "doc".
  The Pub layout convention is to use singular directory names.
  Plural names won't be correctly identified by Pub and other tools.
  See https://dart.dev/tools/pub/package-layout.
Package validation found the following hint:
* The declared SDK constraint is '>=2.15.0 <3.0.0', this is interpreted as '>=2.15.0 <4.0.0'.
  
  Consider updating the SDK constraint to:
  
  environment:
    sdk: '>=2.15.0 <4.0.0'
  

Package has 1 warning and 1 hint.

New Pull Request Checklist

• I have read the Documentation
• I have searched for a similar pull request in the project and found none
• I have updated this branch with the latest main branch to avoid conflicts (via merge from master or rebase)
• I have added the required tests to prove the fix/feature I'm adding
• I have updated the documentation (if necessary)
• I have run the tests without failures
• I have updated the CHANGELOG.md in the corresponding package

Additional context and info (if any)

Our dry-run workflows are not running functionally.

[AlexV525]

Thanks for the great ChatGPT in helping with scripts.