Bump swiftmailer/swiftmailer from 6.2.3 to 6.3.0

[dependabot[bot]]

Bumps swiftmailer/swiftmailer from 6.2.3 to 6.3.0.

Changelog

Sourced from swiftmailer/swiftmailer's changelog.

6.3.0 (2021-10-18)

• Fix support for PHP 8.1

6.2.7 (2021-03-09)

• Allow egulias/email-validator 3.1+

6.2.6 (2021-03-05)

• Fix Bcc support

6.2.5 (2021-01-12)

• Don't trust properties at destruct time
• Remove invalid PHPDocs param in EventDispatcher interface
• Bump license year
• Removes PHP version from README

6.2.4 (2020-12-08)

• Prevent flushing of the bubble queue when event handler raises another event
• Add support for PHP 8
• Code cleanups

Commits

• 8a5d507 Prepare 6.3.0 release
• 56dccc1 Fix changelog
• bc28df7 bug #1355 PHP 8.1 Support (driesvints)
• ee8a1d9 PHP 8.1 Support
• 2a7fb75 minor #1352 Add information about EOM (fabpot)
• 0863074 Add information about EOM
• 23e9ffa Change intro doc page title
• 0cf1030 minor #1336 [Doc] Fixed the syntax of a table in messages.rst (javiereguiluz)
• 93ab97b [Doc] Fixed the syntax of a table in messages.rst
• 6044649 minor #1335 [Doc] Fixed a minor issue in a code example (javiereguiluz)
• Additional commits viewable in compare view

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