Update Config.php for PHP 8.4

[andypost]

Ref drush-ops/drush#6069

[andypost]

PHP Deprecated:  Consolidation\Config\Config::__construct(): Implicitly marking parameter $data as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/web/vendor/consolidation/config/src/Config.php on line 33

Deprecated: Consolidation\Config\Config::__construct(): Implicitly marking parameter $data as nullable is deprecated, the explicit nullable type must be used instead in /var/www/html/web/vendor/consolidation/config/src/Config.php on line 33

[greg-1-anderson]

I'll make new releases with 8.4 support as soon as the CI config is updated to cover 8.4. Will do that as soon as I'm able; PRs also welcome.

[andypost]

@greg-1-anderson CI already can use 8.4 but as I see there's no matrix testing for the package

[greg-1-anderson]

@andypost The matrix is not regular / complete, as I didn't want to test both Linux and Windows across all php versions. Currently, only PHP 8.2 is tested on both Linux and Windows; PHP 8.3 is added in via an "include". PHP 8.4 could be another element in this include list.