[news] Yii Config 1.6

Minor version of Yii Config package was released. There are some new features and improvements:

• Allow to use option "config-plugin-file" in packages
• Add yii-config-info composer command
• Raise minimum Composer version to 2.3
• Change PHP constraint in composer.json to ~8.1.0 || ~8.2.0 || ~8.3.0 || ~8.4.0
• Refactoring: extract config settings reader to separate class
• Minor refactoring of internal classes Options and ProcessHelper
• Raise the minimum PHP version to 8.1 and minor refactoring
• Explicitly mark nullable parameters