Build/Test Tools: Update third-party GitHub Actions.

The following third-party actions have been updated to their latest versions.

- `shivammathur/setup-php` from `2.30.0` to `2.31.1`.
- `actions/setup-node` from `4.0.2` to `4.0.3`.
- `actions/cache` from `4.0.1` to `4.0.2`.
- `actions/upload-artifact` from `4.3.1` to `4.3.4`.
- `slackapi/slack-github-action` from `1.25.0` to `1.26.0`.
- `codecov/codecov-action` from `4.1.0` to `4.5.0`.

See #61564.
Built from https://develop.svn.wordpress.org/trunk@58789


git-svn-id: http://core.svn.wordpress.org/trunk@58191 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58785';
+$wp_version = '6.7-alpha-58789';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.