flake.lock: Updating 'revealjs (hakimel/reveal.js)' - 88fbfc57 -> 28ef437a

### Changes for revealjs

On branch: master
Commits: 88fbfc5751...28ef437a89

- [6aa1eae7](6aa1eae796) foundation for reader mode, activate via 'mode=reader/print' config param
- [f26d3157](f26d31570e) separate reader mode into individual controller, add scroll triggers for fragments
- [0f27ef40](0f27ef40fb) revert demo changes to index.html
- [eaf5f613](eaf5f61318) reader mode; deeplink support, presentation scaling, scroll trigger fixes
- [4da6f6b3](4da6f6b30f) refactoring, fix preload distance
- [5de7da76](5de7da7692) reader mode can be turned off without reload, add Reveal.toggleReader()
- [0861b076](0861b07618) revamped reader mode sticky logic, add option for fullscreen pages
- [f0950ba9](f0950ba9ae) rename 'mode' config value to 'view'
- [e49e89a5](e49e89a557) reader mode supports scroll snapping, sticky pages with scroll triggers are always full height
- [97f2e184](97f2e184c1) fix preload bug
- [4c9cc895](4c9cc89566) refactoring, remove unused layout
- [c856fa9d](c856fa9db1) dispatch slidechange events in reader mode
- [3db2340d](3db2340df3) fix issues with active slide logic in reader mode, foundational work for auto-animate support
- [899a45df](899a45dff6) update api method name
- [ab52d334](ab52d334df) add support for responsively activating reader mode via
- [d84aa347](d84aa3472e) reader mode tests
- [1f1ca3a8](1f1ca3a887) refactoring
- [1871824f](1871824fae) reader mode; named deeplink support, stay on same slide when reader mode is turned on/off
- [f80ee3b9](f80ee3b917) reader mode progress bar
- [23479911](234799114a) reader mode progress bar can be dragged to scroll
- [a6abd042](a6abd0423e) finishing touches on reader mode progress bar
- [2c5a83c9](2c5a83c945) refactoring
- [09f36adc](09f36adc70) mobile tweaks
- [122642fd](122642fdea) reader progress theming, automatically invert based on slide bg
- [be5d8119](be5d811914) convert sass controls spacing to css var, full height reader progress bar
- [980b902a](980b902a9d) disable overview while in reader mode
- [c1b17452](c1b1745200) audit fix
- [d802789c](d802789c4d) more accurate scroll trigger positioning in progress bar
- [198cbc4a](198cbc4ace) reader mode tweaks
- [a7d0916f](a7d0916f28) reader mode accessibility, bug fixes
- [b8b55b8d](b8b55b8d4c) readerScrollBar -> readerScrollbar
- [28ef437a](28ef437a89) rebuild assets

flake.lock

@@ -327,11 +327,11 @@
     "revealjs": {
       "flake": false,
       "locked": {
-        "lastModified": 1695738029,
-        "narHash": "sha256-Z9c9Q41jMkj/DyXOiZYyIa7Gmn8VB8yauTyWrSsT+ps=",
+        "lastModified": 1697112342,
+        "narHash": "sha256-Pwtzm3sqzHNaTM3O/4j/eihBQUmj6RMFfqZfmMC8Pws=",
         "owner": "hakimel",
         "repo": "reveal.js",
-        "rev": "88fbfc5751ad01e3f6adee5819eabeb9e73c3757",
+        "rev": "28ef437a896395caa2f5287de4f984ee94812290",
         "type": "github"
       },
       "original": {