Whatsnew addition

Signed-off-by: Eric Kerfoot <[email protected]>

Author: ericspod

docs/source/whatsnew_1_5_1.md

@@ -1,6 +1,11 @@
 
 # What's new in 1.5.1 🎉🎉
 
-- Support up to Pytorch 2.8
+This is a minor update for MONAI to address security concerns and improve compatibility with the newest PyTorch release.
 
 
+- Support up to Pytorch 2.8,
+- Security fixes to address advisories [GHSA-x6ww-pf9m-m73m](https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-x6ww-pf9m-m73m), [GHSA-6vm5-6jv9-rjpj](https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-6vm5-6jv9-rjpj), and [GHSA-p8cm-mm2v-gwjm](https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-p8cm-mm2v-gwjm),
+- Updated version of supported Huggingface Transformers library to address security advisories raised for it.
+- Updated Torchvision pretrained network loading to use current arguments.
+- Many minor fixes to identified issues, see release notes for details on merged PRs.