[Security] Bump jquery from 3.3.1 to 3.4.0 in /backend

Created by: Tirokk

Authored by dependabot-preview[bot] Apr 23, 2019 Merged Apr 23, 2019

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Bumps jquery from 3.3.1 to 3.4.0. This update includes security fixes.

Vulnerabilities fixed

Sourced from The GitHub Security Advisory Database.

Moderate severity vulnerability that affects jquery A prototype pollution vulnerability exists in jQuery versions < 3.4.0 that allows an attacker to inject properties on Object.prototype.

Affected versions: < 3.4.0

Commits

• b7fc909 3.4.0
• 59ea765 Release: update AUTHORS.txt
• 7c1ef15 Release: update version to 3.4.0-pre
• d940bc0 Build: Update Sizzle from 2.3.3 to 2.3.4
• 9b9fca4 Update README.md
• a2a73db Tests: Make Android Browser 4.0-4.3 dimensions tests green
• 4455f8d Tests: Make Android Browser 4.0-4.3 AJAX tests green
• 0050403 Core: Preserve CSP nonce on scripts with src attribute in DOM manipulation
• fe5f04d Event: Prevent leverageNative from double-firing focusin
• 753d591 Core: Prevent Object.prototype pollution for $.extend( true, ... )
• Additional commits viewable in compare view

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