- Upgrade Phing.
- Patch dependencies to fix outstanding PHP 8 compatibility issues.

- An improvement in the latest php-cs-fixer allows null coalescing rules to be applied more comprehensively.

This allows the driver to work in console utilities as well.

FOLIO: use effectiveLocationId from item record instead of permanantLocationId from holding. (#1669)

- Reduces the chance of problems caused by slow Solr download during "composer install"

- The cache is automatically refreshed if the information on any of the actual MyResearch pages doesn't match the cached status.

This can be accomplished by adding clear_demo=1 parameter to any VuFind url that uses the Demo driver.

- Made session expiration check behavior configurable
- Added support / config setting for reading Shibboleth attributes via headers
- Added support for multiple IdPs (useful in a MultiBackend setup)
- Significant code refactoring/improvement.