Enable Drupal9 Compatibility (#946)

Co-authored-by: Dan Shumaker <[email protected]>

Author: danshumaker

apps/drupal-default/particle_helper/particle_helper.info.yml

@@ -3,5 +3,5 @@ type: module
 description:
   'Particle Components and Particle Tools. Theme utilities to integrate Drupal
   with Particle themes.'
-core: 8.x
+core_version_requirement: ^8.8 || ^9
 package: 'Particle'

apps/drupal-default/particle_theme/particle.info.yml

@@ -2,7 +2,7 @@ name: Particle
 type: theme
 description: A Theme with Pattern Lab
 base theme: stable
-core: 8.x
+core_version_requirement: ^8.8 || ^9
 libraries:
   - particle/core
 libraries-override: