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Motivation
Fixes #4623 to allow BLT to use Robo 4.x.
Proposed changes
Drupal 10.x requires psr/log 3.x but it's not compatible with Robo 3.x (which is what BLT currently requires). So this PR allows updating to Robo 4.x.
I also had to fix the constructor in BltConfig.php to pass an empty array instead of a null value typed as an array. This change appears to be backward compatible with Robo 3.x as well.