[SITE-1140] add release note for new release of wpcm (#9135)

* add release note for new release of wpcm * fix publish date Co-authored-by: Steve Persch <[email protected]> --------- Co-authored-by: Steve Persch <[email protected]>
pantheon-systems · Jul 29, 2024 · 8c4d338 · 8c4d338
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diff --git a/source/releasenotes/2024-07-29-wordpress-composer-managed-1-31-1-update.md b/source/releasenotes/2024-07-29-wordpress-composer-managed-1-31-1-update.md
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+---
+title: WordPress (composer managed) upstream 1.31.1 update now available
+published_date: "2024-07-29"
+categories: [wordpress, action-required]
+---
+
+The update is now available for the [WordPress (composer managed)](/guides/wordpress-composer/wordpress-composer-managed) upstream. Previously, the 1.31.0 update was released and then quickly rolled back. This release fixes issues with subdirectory multisite that were discovered following that earlier release, as well as implements the filter added to the [Pantheon MU Plugin in version 1.4.5](/2024/07/pantheon-mu-plugin-1-4-5).
+
+### Highlights
+* Removes code that for handling wp-admin URLs. This code was not working as intended and testing revealed it to be unnecessary.
+* Adds a filter to disable the subdirectory multisite custom wp-content directory warning. 
+
+For more details, refer to the [WordPress (Composer Managed) changelog](https://github.com/pantheon-systems/wordpress-composer-managed/blob/default/CHANGELOG.md).
+
+#### Applying updates
+
+If you run into merge conflicts with this update, you can manually resolve by running the following command:
+
+```bash
+git pull -Xtheirs https://github.com/pantheon-upstreams/wordpress-composer-managed.git main
+git push origin master
+```
+
+For assistance with managing merge conflicts, refer to our documentation on [auto-resolving via the dashboard](https://docs.pantheon.io/core-updates#apply-upstream-updates-manually-from-the-command-line-to-resolve-merge-conflicts) or [manually resolving via the command line](https://docs.pantheon.io/guides/git/resolve-merge-conflicts).
+
+#### Additional notes
+This release should show up on your dashboard as an available update. It is advised to apply updates manually using the documentation above if there are conflicts, whether you previously applied the 1.31.0 update or not.