Drupal 9 compatibility

Looks good. Thanks!

+1 on RTBC. Did a quick manual check of the code. There isn't any composer.json. No version specific code in here; so it looks like it can run on 8.x and 9.x of Drupal core without any hackery.

Upgrade status report:
--------------------------------------------------------------------------------
Block Content Permissions

2 errors found. 1 warning found.

web/modules/contrib/block_content_permissions/src/Controller/BlockContentPermiss
ionsAddPageController.php:
┌─────────┬──────┬──────────────────────────────────────────────────────────────┐
│ STATUS  │ LINE │                           MESSAGE                            │
├─────────┼──────┼──────────────────────────────────────────────────────────────┤
│ Fix now │ 35   │ Call to deprecated method getStorage() of class              │
│         │      │ Drupal\Core\Entity\EntityManager. Deprecated in drupal:8.0.0 │
│         │      │ and is removed from drupal:9.0.0. Use                        │
│         │      │ Drupal\Core\Entity\EntityTypeManagerInterface::getStorage()  │
│         │      │ instead.                                                     │
│         │      │                                                              │
│ Fix now │ 36   │ Call to deprecated method getStorage() of class              │
│         │      │ Drupal\Core\Entity\EntityManager. Deprecated in drupal:8.0.0 │
│         │      │ and is removed from drupal:9.0.0. Use                        │
│         │      │ Drupal\Core\Entity\EntityTypeManagerInterface::getStorage()  │
│         │      │ instead.                                                     │
│         │      │                                                              │
└─────────┴──────┴──────────────────────────────────────────────────────────────┘

web/modules/contrib/block_content_permissions/block_content_permissions.info.yml:
┌──────────┬──────┬──────────────────────────────────────────────────────────┐
│  STATUS  │ LINE │                         MESSAGE                          │
├──────────┼──────┼──────────────────────────────────────────────────────────┤
│ Check    │ 0    │ Add <code>core_version_requirement: ^8 || ^9

to │
│ manually │ │ block_content_permissions.info.yml to designate that the │
│ │ │ module is compatible with Drupal 9. See │
│ │ │ https://drupal.org/node/3070687. │
│ │ │ │
└──────────┴──────┴──────────────────────────────────────────────────────────┘

Provided the patch, please review.

I checked last patch with drupal-check, Upgrade Status and Drupal Rector and it passed for all 3 tools so I'm adding RTBC

That's fine @pavnish . We just need to update the Issue Summary to state this is for Drupal 9 compatibility.

+1
Looks good! I have sent the maintainer joshua.roberson to urge a commit/release.

This is on dev now.