Update CHANGELOGs for r26.04.

Author: puneetmatharu

ML-Frameworks/pytorch-aarch64/CHANGELOG.md

@@ -13,6 +13,16 @@ where `YY` is the year, and `MM` the month of the increment.
 
 ## [unreleased]
 
+### Added
+
+### Changed
+
+### Removed
+
+### Fixed
+
+## [r26.04] 2026-04-10
+
 ### Added
  - Adds PyTorch [PR #177009](https://github.com/pytorch/pytorch/pull/177009), to accelerate SDPA on Arm CPUs.
  - Adds oneDNN [PR #4911](https://github.com/uxlfoundation/oneDNN/pull/4911), to add LUT-based `gelu_erf` JIT implementations.

ML-Frameworks/tensorflow-aarch64/CHANGELOG.md

@@ -15,6 +15,16 @@ where `YY` is the year, and `MM` the month of the increment.
 
 ### Added
 
+### Changed
+
+### Removed
+
+### Fixed
+
+## [r26.04] 2026-04-10
+
+### Added
+
 ### Changed
  - Replaces patch to bump ComputeLibrary version [from v24.12 to v52.4.0](https://github.com/tensorflow/tensorflow/pull/100882) with [one to bump to v52.8.0](https://github.com/tensorflow/tensorflow/pull/113368)
  - Updates TensorFlow hash to 25cf6546b44bdb3d3f17277a4b49b027dcdc0ae7 from nightly, Mar 23rd