Build/Test Tools: Update 3rd-party GitHub Actions.

This applies several updates to the following 3rd-party GitHub Actions:
- `actions/setup-node`
- `actions/cache`
- `actions/upload-artifact`
- `slackapi/slack-github-action`
- `codecov/codecov-action`.

See #61564.
Built from https://develop.svn.wordpress.org/trunk@59208


git-svn-id: http://core.svn.wordpress.org/trunk@58603 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-beta2-59207';
+$wp_version = '6.7-beta2-59208';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.