[Snyk] Security upgrade reveal.js from 3.3.0 to 3.5.0

[bertrandk]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	658/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-JS-LODASH-1018905	No	Proof of Concept
	753/1000 Why? Proof of Concept exploit, Recently disclosed, Has a fix available, CVSS 7.2	Command Injection SNYK-JS-LODASH-1040724	No	Proof of Concept

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: reveal.js

The new version differs by 217 commits.

• 360bc94 new fix for prematurely autoplaying background videos
• 9f4ed56 larger headings for background sections
• caccf67 add for iframe backgrounds
• b19dc7f don't autoplay background videos in overview mode
• 8e93a1d 3.5.0
• 0c3d89b minor tweak for #1564
• 715cf0b optionally display pacing advice based on slide timings
• 921a605 document clock and timer in speaker notes window
• 9c7fda4 don't show negative signs inside minutes/seconds elements
• 933eba8 round decreasing timers to mirror increasing timers
• 1eada3b avoid deleting existing classes when muting time elements
• b1b4ee2 don't mute minutes when hours is unmuted
• 89b0c5a use opacity for muted clock elements
• a161aca extract time display code into new _displayTime() function
• eb23e58 Allow popup window access to Reveal API
• ef9cbbb add new getSlides() API
• 40912ac clarify getTotalSlides() returns the number of slides
• d75afd6 expose getPastSlideCount() via public API
• eac3799 clarify meaning of getProgress() value
• 9bbd5f2 formatting
• 2289b92 Merge pull request #1851 from astone123/master
• d1d44cf formatting
• 30f2af0 Merge pull request #1844 from riezebosch/pdf-print-stretch
• 8ec5e00 Merge pull request #1843 from riezebosch/pdf-print-callback

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