Prep 2.8.0 release

Author: nvie

CHANGELOG.md

@@ -1,7 +1,5 @@
 ## [Unreleased]
 
-## [2.8.0-1] - 2025-09-24
-
 - New: `anything` is now an alias for `unknown`, which might be more readable in some
   contexts
 - In error output, display promise, bigint, and any other unknown values (instead of
@@ -17,9 +15,6 @@
   - `maybe()` (prefer `nullish()`)
   - `mixed` (prefer `unknown`)
   - `set()` (prefer `setFromArray()`)
-
-## [2.8.0-0] - 2025-09-18
-
 - Drop support for Node 18 and below (they will likely still work, but are no longer
   tested)
 - Export `isDecoder(value)` helper