Changes

#156: Respect group access for products and categories by @Hlavtox
#155: Fix undefined index, fix form headings by @Hlavtox
#153: Use Organization Build Release Github Action by @atomiix
#149: Bump prestashop/php-dev-tools from 3.15.1 to 3.16.1 by @dependabot
#144: Fix license headers - part 2 by @matks
#143: Add dependabot config file by @PierreRambaud
#141: Add prepend-autoloader: false in composer.json by @matks
#140: Add badges into README by @matks
#158: Release 4.2.1 by @Progi1984
#157: Bump version to 4.2.1 by @Progi1984
#151: Improved Github Action (Support PHP 5.6 => 8.1) by @Progi1984
#146: Migrated Travis CI to Github Actions by @Progi1984
#145: Update logo and short description by @Julievrz
#152: Fixed PHP Notice: Trying to access array offset on value of type bool in /www/modules/gsitemap/gsitemap.php on line 419 by @metacreo
#150: Set property tab by @PrestaEdit

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