[Sources] Update link to blog post detailing GitHub archives policy (#301)

Author: giordano

src/Sources.jl

@@ -31,7 +31,7 @@ function check_github_archive(url::String)
                             The archive automatically generated by GitHub
                               $(url)
                             may not have a stable checksum in the future, thus cannot be used as a reliable source, see
-                            <https://github.blog/changelog/2023-01-30-git-archive-checksums-may-change/>.
+                            <https://github.blog/2023-02-21-update-on-the-future-stability-of-source-code-archives-and-hashes/>.
                             Use a different source, for example a `GitSource`, or an official release artifact uploaded
                             by the maintainers of the package (*not* the automatic archive produced by GitHub).
                             """))