4.3.3

• [CVE-2021-27938] Prevent echoing request variable (Steve Boyd) - 4c8aa39
• Use tagged versions for 1.x recipe-cms, use trusty (Steve Boyd) - a70e5f5
• Remove phpcs runs from 4.0 branch, code not compliant (Robbie Averill) - e6e1827
• Add phpcs ruleset from 4.4 branch (Robbie Averill) - bd6a48a
• Add codesniffer to dev dependencies (Robbie Averill) - 4e1bb1f
• Update Travis configuration (Robbie Averill) - e01a2b6
• Remove use of deprecated DB::getConn() and run import optimisation (Robbie Averill) - b7b5624
• Fix(mutex) make the mutex update check for finished or running jobs (Stephen McMahon) - 0b39d8c
• FIX: Add check for SubsiteID (James Ayers) - 801390e
• Add PHP 7.3 and SilverStripe 4.3 to Travis builds (Robbie Averill) - 53682b6
• FIX Cleanup tasks now uses Configurable and correctly re-enqueues itself (Robbie Averill) - df22515