[css-2025][css-ui-4] Add `accent-color` property, `auto` value for `outline-color`, and `<url-set>` value for `cursor` to Safe to Release exceptions

[SebastianZ]

Splitting the discussion from #10687 for adding the accent-color property, auto value for outline-color property, and <url-set> value for the cursor property from CSS UI 4 to the Safe to Release pre-CR Exceptions section of the CSS Snapshot 2025.

Data to consider:

• Spec. status: WD (last published: 16 March 2021)
• accent-color implemented in all major browsers (partially in Safari) since 2022, auto value implemented in Safari, <url-set> implemented at least in Firefox since 2021
• WPT: passing tests: Chrome: 483, Edge: 483, Firefox: 482, Safari: 488; interop: 482 / 490 (98.3%)
• Open issues: on GitHub: ~5 (1 editorial), in spec.: 0

Summary: Very high interoperability, few open issues

Sebastian