niv reveal.js: update e09437f4 -> 0582f575

## Changelog for reveal.js:
Commits: [hakimel/reveal.js@e09437f4...0582f575](hakimel/reveal.js@e09437f...0582f57)

* [`ffadcc85`](hakimel/reveal.js@ffadcc8) v4.1.0
* [`0582f575`](hakimel/reveal.js@0582f57) add fit-text to demo

Author: github-actions[bot]

nix/sources.json

@@ -173,10 +173,10 @@
         "homepage": "https://revealjs.com",
         "owner": "hakimel",
         "repo": "reveal.js",
-        "rev": "e09437f4fac47305679374d2b2516a76f6ceb899",
-        "sha256": "0mppzm0cp5v4r7aqim2jbxji836di86an0p9j5wjmnlg5ali3y49",
+        "rev": "0582f57517c97a4c7bfeb58762138c78883f94c5",
+        "sha256": "10xhblbyw8mvak58d294hbxxnf5sq0akj6qldv7brgm6944zppm0",
         "type": "tarball",
-        "url": "https://github.com/hakimel/reveal.js/archive/e09437f4fac47305679374d2b2516a76f6ceb899.tar.gz",
+        "url": "https://github.com/hakimel/reveal.js/archive/0582f57517c97a4c7bfeb58762138c78883f94c5.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "rotate-text.el": {