[fastlane_core][configuration] suggestion message improvement when fetching value with non-symbol key

[crazymanish]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

• When fetching value with non-symbol key Fastlane provides us the suggestion to use symbol key, which was slightly outdated and was using :app_id in the example always.

Description

• Fix the suggestion message, now Fastlane will provide us symbol key suggestion always instead of hardcoded :app_id

Testing Steps

• Updated unit tests
• Nothing changed in functionality

[joshdholtz]

I can’t believe it was every doing this 😛 Thank you for improving this! Really appreciate it ❤️

[fastlane-bot]

Hey @crazymanish 👋

Thank you for your contribution to fastlane and congrats on getting this pull request merged 🎉
The code change now lives in the master branch, however it wasn't released to RubyGems yet.
We usually ship about once a week, and your PR will be included in the next one.

Please let us know if this change requires an immediate release by adding a comment here 👍
We'll notify you once we shipped a new release with your changes 🚀

[fastlane-bot]

Congratulations! 🎉 This was released as part of fastlane 2.184.0 🚀