Adding What's New Page for 1.5.2 Release (#8720)

### Description

This adds the "what's new" page for the minor 1.5.2 release. This commit
should probably just be cherry-picked for the release. Branch rules will
have to be temporarily broken to allow the PR past blossom as well,
since no code is modified here this is safe and it's only the
documentation generation that should be checked.

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [x] Documentation updated, tested `make html` command in the `docs/`
folder.

---------

Signed-off-by: Eric Kerfoot <17726042+ericspod@users.noreply.github.com>
Co-authored-by: YunLiu <55491388+KumoLiu@users.noreply.github.com>

Author: ericspod

CHANGELOG.md

@@ -5,6 +5,12 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ## [Unreleased]
 
+## [1.5.2] - 2026-01-28
+
+## What's Changed
+### Fixed
+* Fix Zip Slip vulnerability in NGC private bundle download (#8682)
+
 ## [1.5.1] - 2025-09-22
 
 ## What's Changed
@@ -1261,7 +1267,8 @@ the postprocessing steps should be used before calling the metrics methods
 
 [highlights]: https://github.com/Project-MONAI/MONAI/blob/master/docs/source/highlights.md
 
-[Unreleased]: https://github.com/Project-MONAI/MONAI/compare/1.5.1...HEAD
+[Unreleased]: https://github.com/Project-MONAI/MONAI/compare/1.5.2...HEAD
+[1.5.2]: https://github.com/Project-MONAI/MONAI/compare/1.5.1...1.5.2
 [1.5.1]: https://github.com/Project-MONAI/MONAI/compare/1.5.0...1.5.1
 [1.5.0]: https://github.com/Project-MONAI/MONAI/compare/1.4.0...1.5.0
 [1.4.0]: https://github.com/Project-MONAI/MONAI/compare/1.3.2...1.4.0

docs/source/whatsnew.rst

@@ -6,6 +6,7 @@ What's New
 .. toctree::
    :maxdepth: 1
 
+   whatsnew_1_5_2.md
    whatsnew_1_5_1.md
    whatsnew_1_5.md
    whatsnew_1_4.md

docs/source/whatsnew_1_5_1.md

@@ -1,5 +1,5 @@
 
-# What's new in 1.5.1 🎉🎉
+# What's new in 1.5.1
 
 This is a minor update for MONAI to address security concerns and improve compatibility with the newest PyTorch release.
 

docs/source/whatsnew_1_5_2.md

@@ -0,0 +1,6 @@
+
+# What's new in 1.5.2 🎉🎉
+
+This is a minor update for MONAI to address a security concern.
+
+- Security fix to address advisory [GHSA-9rg3-9pvr-6p27](https://github.com/Project-MONAI/MONAI/security/advisories/GHSA-9rg3-9pvr-6p27).