1.x-3.5.0

Update to Diff module that brings it into compatibility with current versions of PHP (up to PHP 8.3), cleans up deprecated function calls, and switches Diff module to use the built-in DiffEngine provided by Backdrop core.

What's Changed

• Switch to Backdrop core-provided Diff Engine. Fixes #27 by @anemirovsky in #34
• Issue #17: 'Use admin theme' setting broken by @klonos in #19
• Issue #16: Default diff state not respected by @klonos in #21

New Contributors

• @klonos made their first contribution in #22
• @quicksketch made their first contribution in #36
• @anemirovsky made their first contribution in #34

Full Changelog: 1.x-3.4.0...1.x-3.5.0