flake.lock: Updating 'revealjs (hakimel/reveal.js)' - 0301ce58 -> 12f5ba4c

### Changes for revealjs

On branch: master
Commits: 0301ce58ab...12f5ba4c9d

- [0b443087](0b44308754) add ln-start-from for code sections to markdown
- [bf749ee1](bf749ee1da) add tests
- [227f90fa](227f90fa00) fix code block auto-animate bug that caused unmatched lines to appear without fading in
- [12f5ba4c](12f5ba4c9d) auto-slide duration falls back on global setting instead of looking at first fragment

flake.lock

@@ -343,11 +343,11 @@
     "revealjs": {
       "flake": false,
       "locked": {
-        "lastModified": 1681386605,
-        "narHash": "sha256-9Q7aWgjAV37iJp6oYDz45e8J+RKwKY1Uvgg/BXwf5nQ=",
+        "lastModified": 1686910306,
+        "narHash": "sha256-3R1ygMi07/hj4S9O45/g5SOd9ClvtQ347GSsH/MAY/U=",
         "owner": "hakimel",
         "repo": "reveal.js",
-        "rev": "0301ce58ab185f7191696e16b1b6389f58df2892",
+        "rev": "12f5ba4c9d53c500ec20aea2cc8b8f66e725026a",
         "type": "github"
       },
       "original": {