docs(CHANGELOG): port 26.0.{3,4} release notes

Author: ErichDonGubler

CHANGELOG.md

@@ -73,6 +73,20 @@ Naga now requires that no type be larger than 1 GB. This limit may be lowered in
 
 Fix `STATUS_HEAP_CORRUPTION` crash when concurrently calling `create_sampler`. By @atlv24 in [#8043](https://github.com/gfx-rs/wgpu/pull/8043).
 
+## v26.0.4 (2025-08-06)
+
+### Bug Fixes
+
+#### Vulkan
+
+Fix `STATUS_HEAP_CORRUPTION` crash when concurrently calling `create_sampler`. By @atlv24 in [#8056](https://github.com/gfx-rs/wgpu/pull/8056).
+
+## v26.0.3 (2025-07-30)
+
+### Bug Fixes
+
+- Fixed memory leak in vulkan backend. By @cwfitzgerald in [#8031](https://github.com/gfx-rs/wgpu/pull/8031).
+
 ## v26.0.2 (2025-07-23)
 
 ### Bug Fixes