Docs: fix link to blog post (#12270)

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Author: humitos

docs/user/reference/git-integration.rst

@@ -235,7 +235,7 @@ GitHub App
 
 .. warning::
 
-   Our GitHub App is currently in beta, see our `blog post <https://about.readthedocs.com/blog/2025/06/welcome-to-our-beta-github-app/>`__ for more information.
+   Our GitHub App is currently in beta, see our `blog post <https://about.readthedocs.com/blog/2025/06/announcing-our-github-app-beta/>`__ for more information.
 
 We are in the process of migrating our GitHub OAuth application to a `GitHub App <https://docs.github.com/en/apps/overview>`__.
 We have two GitHub Apps, one for each of our platforms: