fix(deps): update dependency katex to v0.16.21 [security]

Author: renovate[bot]

package.json

@@ -65,7 +65,7 @@
     "dayjs": "1.11.11",
     "framer-motion": "11.3.4",
     "fuse.js": "7.0.0",
-    "katex": "0.16.11",
+    "katex": "0.16.21",
     "next": "14.1.4",
     "next-auth": "4.24.7",
     "next-mdx-remote": "4.4.1",