[Security] Bump swiftmailer/swiftmailer from 5.4.4 to 5.4.12

[dependabot-preview[bot]]

Bumps swiftmailer/swiftmailer from 5.4.4 to 5.4.12. This update includes security fixes.

Vulnerabilities fixed

*Sourced from [The PHP Security Advisories Database](https://github.com/FriendsOfPHP/security-advisories/blob/master/swiftmailer/swiftmailer/CVE-2016-10074.yaml).* > **Remote Code Execution when using the mail transport** > > Affected versions: >=4.0.0, <5.0.0; >=5.0.0, <5.4.5

Changelog

*Sourced from [swiftmailer/swiftmailer's changelog](https://github.com/swiftmailer/swiftmailer/blob/v5.4.12/CHANGES).* > 5.4.12 (2018-07-31) > ------------------- > > * fixed typo > > 5.4.11 (2018-07-31) > ------------------- > > * fixed startTLS support for PHP 5.6- > > 5.4.10 (2018-07-27) > ------------------- > > * fixed startTLS only allowed tls1.0, now allowed: tls1.0, tls1.1, tls1.2 > > 5.4.9 (2018-01-23) > ------------------ > > * no changes, last version of the 5.x series > > 5.4.8 (2017-05-01) > ------------------ > > * fixed encoding inheritance in addPart() > * fixed sorting MIME children when their types are equal > > 5.4.7 (2017-04-20) > ------------------ > > * fixed NTLMAuthenticator clobbering bcmath scale > > 5.4.6 (2017-02-13) > ------------------ > > * removed exceptions thrown in destructors as they lead to fatal errors > * switched to use sha256 by default in DKIM as per the RFC > * fixed an 'Undefined variable: pipes' PHP notice > * fixed long To headers when using the mail transport > * fixed NTLMAuthenticator when no domain is passed with the username > * prevented fatal error during unserialization of a message > * fixed a PHP warning when sending a message that has a length of a multiple of 8192 > > 5.4.5 (2016-12-29) > ------------------ > > * SECURITY FIX: fixed CVE-2016-10074 by disallowing potentially unsafe shell characters > > Prior to 5.4.5, the mail transport (Swift_Transport_MailTransport) was vulnerable to passing > arbitrary shell arguments if the "From", "ReturnPath" or "Sender" header came > from a non-trusted source, potentially allowing Remote Code Execution > ... (truncated)

Commits

- [`181b89f`](https://github.com/swiftmailer/swiftmailer/commit/181b89f18a90f8925ef805f950d47a7190e9b950) prepared the 5.4.12 release - [`dccdd7c`](https://github.com/swiftmailer/swiftmailer/commit/dccdd7c37aeb622e04dbaf3477f690b24998012f) updated CHANGES - [`d96063e`](https://github.com/swiftmailer/swiftmailer/commit/d96063e9e57b3b2f67de6e465cc5353c29612fe8) fixed typo - [`7c6640e`](https://github.com/swiftmailer/swiftmailer/commit/7c6640e59cb4aa9ca06d41e937983cb20475874d) prepared the 5.4.11 release - [`5a82b2e`](https://github.com/swiftmailer/swiftmailer/commit/5a82b2ef8aa5b56229a3a1f6d86142be6a3d82b7) updated CHANGES - [`d9aed42`](https://github.com/swiftmailer/swiftmailer/commit/d9aed422e20f2191d5d4324fce102b3db9b5de6b) refactored code - [`421299e`](https://github.com/swiftmailer/swiftmailer/commit/421299e29b1a24b6069cdc0e034d90c1d5764367) bug [#1112](https://github-redirect.dependabot.com/swiftmailer/swiftmailer/issues/1112) wxu: Fix release version is not compatible with low version PHP (wxu) - [`c14b7af`](https://github.com/swiftmailer/swiftmailer/commit/c14b7afc5f746cf88512add4456be5d1d0e0eda6) wxu: Fix release version is not compatible with low version PHP - [`dd71cc1`](https://github.com/swiftmailer/swiftmailer/commit/dd71cc1638ed7aebbb33f2e2b0edd2cf6ea73d97) prepared the 5.4.10 release - [`5fbe82f`](https://github.com/swiftmailer/swiftmailer/commit/5fbe82f7d5e6762ef237e53504312af68e32fc55) Allow explicit tls1.0, tls1.1, tls1.2 for startTLS - Additional commits viewable in [compare view](https://github.com/swiftmailer/swiftmailer/compare/v5.4.4...v5.4.12)

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[edno]

@dependabot ignore this dependency this depends on laravel/framework

[dependabot-preview[bot]]

OK, I won't notify you about swiftmailer/swiftmailer again, unless you re-open this PR or update it yourself. 😢