announce the NumPy 1.26.3 release (#715)

Author: charris

content/en/news.md

@@ -377,6 +377,7 @@ Here is a list of NumPy releases, with links to release notes. Bugfix
 releases (only the `z` changes in the `x.y.z` version number) have no new
 features; minor releases (the `y` increases) do.
 
+- NumPy 1.26.3 ([release notes](https://github.com/numpy/numpy/releases/tag/v1.26.2)) -- _2 Jan 2024_.
 - NumPy 1.26.2 ([release notes](https://github.com/numpy/numpy/releases/tag/v1.26.2)) -- _12 Nov 2023_.
 - NumPy 1.26.1 ([release notes](https://github.com/numpy/numpy/releases/tag/v1.26.1)) -- _14 Oct 2023_.
 - NumPy 1.26.0 ([release notes](https://github.com/numpy/numpy/releases/tag/v1.26.0)) -- _16 Sep 2023_.