Bump WordPress "tested up to" version 6.1

[iamdharmesh]

Description of the Change

Bump WordPress "tested up to" version 6.1

Closes #84

How to test the Change

Tested the following scenarios in a WP 6.1 environment:

• Uploading an SVG from the Media Library > Add New page
• Uploading an SVG from the drag and drop uploader
• Viewing an SVG's single attachment edit screen
• Viewing an SVG's single attachment overlay edit screen
• Adding an SVG to the Image block (both uploading directly and pulling from the Media Library)
• Using an SVG as a featured image
• Outputting an SVG directly using get_image_tag
• Outputting an SVG directly using wp_get_attachment_image

Changelog Entry

Changed - Bump WordPress "tested up to" version 6.1

Credits

Props @iamdharmesh

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[peterwilsoncc]

LGTM, testing notes seem solid.

I did a few of the steps with define( 'ALLOW_UNFILTERED_UPLOADS', false ); in my config file and it behaved as expected.