Bump symfony/mime from 4.3.2 to 4.4.1 in /system

[dependabot[bot]]

Bumps symfony/mime from 4.3.2 to 4.4.1.

Changelog

Sourced from symfony/mime's changelog.

CHANGELOG

4.4.0

• [BC BREAK] Removed NamedAddress (Address now supports a name)
• Added PHPUnit constraints
• Added AbstractPart::asDebugString()
• Added Address::fromString()

4.3.3

• [BC BREAK] Renamed method Headers::getAll() to Headers::all().

4.3.0

• Introduced the component as experimental

Commits

• 010cc48 bug #34032 [Mime] Fixing multidimensional array structure with FormDataPart (...
• 89da7b6 Merge branch '4.3' into 4.4
• 22aecf6 [Mime] fix guessing mime-types of files with leading dash
• bf6913d Merge branch '4.3' into 4.4
• 3c0e197 [4.3] Remove unused local variables
• 86fe792 minor #33963 Add .gitignore to .gitattributes (reedy)
• 51d5b0e Changing the multipart form-data behavior to use the form name as an array, w...
• ae5a66b Merge branch '4.3' into 4.4
• a6b152c Merge branch '3.4' into 4.3
• 592a01c Add Message-Id to SentMessage when sending an email
• Additional commits viewable in compare view

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