flake.lock: Updating 'revealjs (hakimel/reveal.js)' - 9415ad5d -> 0ca38972 (#128)

### Changes for revealjs

On branch: master
Commits: 9415ad5d7f...0ca389721c

- [286d5ef5](286d5ef561) made data-background attribute work with .webp [hakimel/reveal.js⁠#3200](http://r.duckduckgo.com/l/?uddg=https://github.com/hakimel/reveal.js/issues/3200)
- [eada286c](eada286ca0) fix issue where auto-animate did not work when jumping three or more slides (i.e. longer than the view distance)
- [0ca38972](0ca389721c) add support for 'data-background-gradient' [hakimel/reveal.js⁠#2510](http://r.duckduckgo.com/l/?uddg=https://github.com/hakimel/reveal.js/issues/2510)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

flake.lock

@@ -291,11 +291,11 @@
     "revealjs": {
       "flake": false,
       "locked": {
-        "lastModified": 1649243708,
-        "narHash": "sha256-yBCBpnUTJG6EphpRzID61vVlwqrm5iuKDVQjkAQZTkQ=",
+        "lastModified": 1651495761,
+        "narHash": "sha256-B3L8h0CyYgZCen8aWyLiDXHZMugXAzFToLJNg8f2PWU=",
         "owner": "hakimel",
         "repo": "reveal.js",
-        "rev": "9415ad5d7f329ccd8fbc82627789396a57fdbb3d",
+        "rev": "0ca389721c5c7eff5db6f67159cbb1cdd51a3d7f",
         "type": "github"
       },
       "original": {