docs(changelog): stamp 0.10.0 release date

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: dfa1

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.10.0] — 2026-06-26
+
 ### Added
 
 - `DType.isUnsigned()` — `true` for the unsigned integer primitives (`U8`–`U64`), `false` otherwise. ([#159](https://github.com/dfa1/vortex-java/issues/159))