Update dependency reveal.js to v3.9.2

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
reveal.js (source)	minor	3.8.0 -> 3.9.2

Warnings (1)

Please correct - or verify that you can safely ignore - these warnings before you merge this PR.

• reveal.js/js/reveal.js: Could not determine new digest for update (cdnjs package reveal.js/js/reveal.js)

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[!WARNING] Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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Release Notes

hakimel/reveal.js (reveal.js)

### [`v3.9.2`](https://togithub.com/hakimel/reveal.js/releases/tag/3.9.2) [Compare Source](https://togithub.com/hakimel/reveal.js/compare/3.9.1...3.9.2) Fixes a security vulnerability in the postMessage API. The follow methods are now blacklisted and can not be called via the postMessage API: `registerPlugin`, `registerKeyboardShortcut`, `addKeyBinding`, `addEventListener`. ### [`v3.9.1`](https://togithub.com/hakimel/reveal.js/releases/tag/3.9.1) [Compare Source](https://togithub.com/hakimel/reveal.js/compare/3.9.0...3.9.1) This version contains no changes. It was only released to bump the published version on npm. 3.9.0 was published to npm with local edits 🤦‍♂️ ### [`v3.9.0`](https://togithub.com/hakimel/reveal.js/releases/tag/3.9.0) [Compare Source](https://togithub.com/hakimel/reveal.js/compare/3.8.0...3.9.0) **Changes:** - Adds [step-by-step code highlights](https://togithub.com/hakimel/reveal.js/blob/master/README.md#step-by-step-highlights)! Step through multiple line highlights on the same code block. - Adds [postMessage callbacks](https://togithub.com/hakimel/reveal.js#postmessage-callbacks). Makes it possible to use the postMessage API to invoke reveal.js methods with return values. - The pacing timer functionality now accepts a total time for the whole presentation. Timing was previously worked out on a per-slide level. ([#​2400](https://togithub.com/hakimel/reveal.js/issues/2400) by longtime reveal.js contributor [@​fghaas](https://togithub.com/fghaas)!) - Background iframes no longer preload by default. They load when you arrive at the given slide. This unifies the behavior of in-slide and background iframes. [Learn how to turn on preloading](https://togithub.com/hakimel/reveal.js#lazy-loading-iframes). - The slide number format specified through `slideNumber` is now honored in PDF exports. ([#​2337](https://togithub.com/hakimel/reveal.js/issues/2337) by [@​dougalsutherland](https://togithub.com/dougalsutherland)) ([`4c557a5`](https://togithub.com/hakimel/reveal.js/commit/4c557a5959b3ad909056df6cb46c5bf56a0da8ee)) - Adds `data-fragment=` to any slide

with fragments in it. This lets you target specific fragment states with CSS like `section[data-fragment="2"] { ... }`. - Adds `Reveal.getHorizontalSlides()` and `Reveal. getVerticalSlides()` for getting all horizontal/vertical slides in a deck. - Adds `Reveal.hasHorizontalSlides()` and `Reveal. hasVerticalSlides()` for checking whether or not a deck contains any horizontal or vertical slides. - Adds `mobileViewDistance` configuration option. Mobile view distance was previously hardcoded at 2. ([#​2513](https://togithub.com/hakimel/reveal.js/issues/2513) by [@​TuurDutoit](https://togithub.com/TuurDutoit)) - Adds `allow="autoplay"` to iframes to comply with Chrome's [Autoplay Policy Changes](https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#iframe) ([#​2437](https://togithub.com/hakimel/reveal.js/issues/2437) by [@​TehDmitry](https://togithub.com/TehDmitry)) - Switches to CSS transforms to scale decks up on HDPI displays. Previous use of CSS zoom produced sharper results but led to side effects such as iframes not scaling with the deck content. - Switches first/last slide keyboard shortcuts from ⌘←/⌘→ to Shift←/Shift→. The old shortcut conflicted with browser back/forward. - Updates highlight.js from 9.11.0 to 9.18.0 **Bug fixes:** - Fixes an issue where the navigation down-arrow was blocked by the progress bar ([#​2410](https://togithub.com/hakimel/reveal.js/issues/2410) by [@​NoriSte](https://togithub.com/NoriSte)). - Fixes swipe navigation for decks with `navigationMode` set to `linear` ([#​2416](https://togithub.com/hakimel/reveal.js/issues/2416) by [@​earboxer](https://togithub.com/earboxer)). - Fixes vertical overflow in iPadOS Safari. - Fixes inconsistent fragment slide animations by translating by a fixed unit. - Fixes failing npm install because of outdated dependencies. - Fixes exception when highlighting empty code blocks. [And more...](https://togithub.com/hakimel/reveal.js/compare/3.8.0...3.9.0)

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PR Summary

• Updated version of the reveal.js library The PR updates the version of the reveal.js library we are using in our project. It changes the link and script tags in the index.html file to use the latest version, 3.9.2. This update will ensure that we benefit from the latest developments and security enhancements in the library.

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