update icon: illustrator (plain, line)

[Anjellyrika]

Double check these details before you open a PR

• PR does not match another non-stale PR currently opened
• PR name matches the format new icon: Icon name (versions separated by comma). More details here
• PR's base is the develop branch.
• Your icons are inside a folder as seen here
• SVG matches the standards laid out here
• A new object is added in the devicon.json file at the correct alphabetic position as seen here

This PR closes #1655

Link to prove your SVG is correct and up-to-date.

✨ This PR updates the Adobe Illustrator icons in line with Adobe's brand identity change. Also added an 'original' version of the icon that was previously missing, sourced from Wikimedia Commons.

[canaleal]

Excellent work on the MR. I just left a few comments.

[weh]

Just added empty lines. I think this is ready to merge now. 👍

[github-actions]

Hi!

I'm the check-bot and we have some issues with your PR:

devicon.json is not sorted correctly.
Please make sure that your icon is added in the `devicon.json` file at the correct alphabetic position
as seen here: https://github.com/devicons/devicon/wiki/Updating-%60devicon.json%60

Check our CONTRIBUTING guide for more details regarding these errors.

Please address these issues. When you update this PR, I will check your SVGs again.

Thanks for your help,
SVG-Checker Bot 😄