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

[Franky5831]

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! 👋

Thank you for sending this PR!

We expect the following in all Pull Requests (PRs).

• PRs must be sent to the appropriate branch
• All git commits must be GPG-signed
• Must follow our style guide
• Be commented in the PHP source file
• Be documented in the user guide
• Be unit tested
• Pass all checks in GitHub Actions

Important

We expect all code changes or bug-fixes to be accompanied by one or more tests added to our test suite to prove the code works.

If pull requests do not comply with the above, they will likely be closed. Since we are a team of volunteers, we don't have any more time to work
on the framework than you do. Please make it as painless for your contributions to be included as possible.

See https://github.com/codeigniter4/CodeIgniter4/blob/develop/contributing/pull_request.md

Sincerely, the mergeable bot 🤖

[Franky5831]

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?

[Franky5831]

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.