Bump jquery from 2.2.4 to 3.4.1

[dependabot[bot]]

Bumps jquery from 2.2.4 to 3.4.1.

Commits

• 75f7e96 3.4.1
• 7dddb19 Core: Make isAttached work with iOS 10.0-10.2
• 6c1e7db Event: Prevent leverageNative from registering duplicate dummy handlers
• 24d71ac Event: Fix handling of multiple async focus events
• b4fadc9 Build: Test on Node.js 12, stop testing on Node.js 6 & 11
• 0d4af52 Build: Fix unresolved jQuery reference in finalPropName
• 22caea8 Build: Updating the 3.4-stable version to 3.4.1-pre
• 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
• Additional commits viewable in compare view

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