Bump drupal-rector to beta version
### Problem/Motivation Update the drupal-rector dependency constraint to target a beta release version. ### Work items - Commit(s): [121ddc618f](https://git.drupalcode.org/project/project_analysis/-/commit/121ddc618f0e), [34e88727c1](https://git.drupalcode.org/project/project_analysis/-/commit/34e88727c1a9) ### Credit - Implemented by: @bbrala --- *Filed retroactively as part of the Drupal 12 rector coverage effort. Closed as fixed; credit to be applied to the contributors listed above.* *AI was used extensively to build this work and to file this issue. See [Dries Buytaert: AI-generated Rector rules for Drupal](https://dri.es/ai-generated-rector-rules-for-drupal) and [Björn Brala: Drupal Rector rules are config, not code. Mostly.](https://www.linkedin.com/pulse/drupal-rector-rules-config-code-mostly-bj%C3%B6rn-brala-vfpwe/).*
issue