Upgrade deprecated classes

• /htmlmail.info.yml
• /htmlmail.module
• /src/Form/HtmlMailConfigurationForm.php
• /src/Form/HtmlMailTestForm.php
• /src/Helper/HtmlMailHelper.php
• /src/Plugin/Mail/HtmlMailSystem.php
• /src/Utility/HtmlMailMime.php
• /htmlmail.services.yml

added 1 commit

• 615e1830 - Mettre à jour le fichier .gitlab-ci.yml

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