docs: update CHANGELOG.md for v3.7.0-rc4 (#14658)

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Signed-off-by: Alan Clucas <[email protected]>
Co-authored-by: Joibel <[email protected]>
Co-authored-by: Alan Clucas <[email protected]>

Author: github-actions[bot]

CHANGELOG.md

@@ -1,5 +1,19 @@
 # Changelog
 
+## v3.7.0-rc4 (2025-07-15)
+
+Full Changelog: [v3.7.0-rc3...v3.7.0-rc4](https://github.com/argoproj/argo-workflows/compare/v3.7.0-rc3...v3.7.0-rc4)
+
+### Selected Changes
+
+* [d1d689b36](https://github.com/argoproj/argo-workflows/commit/d1d689b367c4c8a5a8a095ae60b5d7043f99eda9) fix: process aggregate outputs for steps node with retries. Fixes #14647 (#14651)
+
+<details><summary><h3>Contributors</h3></summary>
+
+* jswxstw
+
+</details>
+
 ## v3.7.0-rc3 (2025-06-25)
 
 Full Changelog: [v3.7.0-rc2...v3.7.0-rc3](https://github.com/argoproj/argo-workflows/compare/v3.7.0-rc2...v3.7.0-rc3)