fix: added "application/octet-stream" to the "stl" mime type in the M…

[FrancescoCiannavei]

Description
I added the "application/octet-stream" to the "stl" mime type in the Mimes config class.
When I upload a stl file the mime type returns as "application/octet-stream" and the ext_in input validation returns false.
Reference issue: Issue: 9510.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[mergeable]

Hi there, Franky5831! 👋

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[FrancescoCiannavei]

I previously created this pull request but I closed since the commit wasn't verified and created this one.

[michalsn]

Thank you. Please add a changelog entry here: https://github.com/codeigniter4/CodeIgniter4/blob/develop/user_guide_src/source/changelogs/v4.6.1.rst
Probably in the Changes section.

[michalsn]

Thank you!

[paulbalandan]

Should the model/stl mime be added also as mentioned in the linked issue?

[michalsn]

@paulbalandan Oh, you're right - I forgot about model/stl. It's listed in the IANA database, so we can safely rely on it.

@Franky5831 Can you add it to the config array and also mention it in the changelog?

[FrancescoCiannavei]

Sorry @michalsn I think I lost you, I created a pull request where I edited $mimes array from the app/Config/Mimes.php file, then I added the change to the v4.6.1.rst file for the changelog. What should I do?
Thanks

[michalsn]

This is exactly what I have in mind.

[michalsn]

Thank you for your first contribution to the CodeIgniter framework @Franky5831