Automated Drupal 11 compatibility

Problem/Motivation

The module is currently not compatible with Drupal 11. The core_version_requirement needs to be updated and any deprecated code must be resolved to ensure the module works on the latest major version.

Steps to reproduce

• Attempt to install the module on a Drupal 11 environment.
• Run the upgrade_status module analysis on the codebase.

Proposed resolution

• Update http_auth.info.yml to allow Drupal 10 and 11 (^10 || ^11) and remove the deprecated core: 8.x key.
• Fix YAML syntax by adding quotes to strings.
• Resolve any remaining PHP/Drupal deprecations across the module files.

Remaining tasks

Code review and merge.

User interface changes

None.

API changes

None.

Data model changes

None.