Update pelago/emogrifier to v6.x

[github-jira-sync-bot]

Currently Magento depends on

"pelago/emogrifier": "^5.0.0",

 which does not support PHP8.1. Support of PHP8.1 added in v6.x

 

AC:

• upgrade constrain in composer.json to install pelago/emogrifier  v6.x
• make related changes in magento codebase if needed
• verify with PHP7.4 and PHP8.0(manual & automated tests)

[github-jira-sync-bot]

The issue was exported from the internal Jira. The link to the original Jira issue: https://jira.corp.magento.com/browse/AC-1514

[m2-assistant]

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[karyna-t]

@magento I am working on this