docs: update software

Author: openscript

src/content/notes/tools/software.en.mdx

@@ -14,6 +14,7 @@ There are many web-based tools I use, but here are some of the most important on
 - [Hoppscotch](https://hoppscotch.io) for API development.
 - [DevDocs](https://devdocs.io) for offline access to documentation.
 - [.gitginore.io](https://gitignore.io) for creating `.gitignore` files.
+- [endoflife.date](https://endoflife.date) for updating software before it's too late.
 
 ## Linux