Bump WordPress "tested up to" version 6.6

[ankitguptaindia]

Description of the Change

This PR bumps the WP tested up to version 6.6

Closes https://github.com/10up/safe-svg/issues/207

How to test the Change

Changelog Entry

Changed - Bump WordPress "tested up to" version 6.6.

Credits

Props @sudip-md, @ankitguptaindia

Checklist:

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

[ankitguptaindia]

Hello @jeffpaul,

This plugin has a very old WordPress version as the Minimum WP requirement. Is this intentional?

https://github.com/10up/safe-svg/blob/fae7eee0b04c3cae2197514cf4b51d6025283522/safe-svg.php#L7

[jeffpaul]

Nope, that can be bumped accordingly.