Bump subset-font from 2.3.0 to 2.4.0 in /screencast

Bumps [subset-font](https://github.com/papandreou/subset-font) from 2.3.0 to 2.4.0.
- [Changelog](https://github.com/papandreou/subset-font/blob/master/CHANGELOG.md)
- [Commits](papandreou/subset-font@v2.3.0...v2.4.0)

---
updated-dependencies:
- dependency-name: subset-font
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

screencast/package.json

@@ -15,7 +15,7 @@
     "@fontsource/dejavu-mono": "^5.0.11",
     "nunjucks": "^3.2.4",
     "pretty-bytes": "^6.1.1",
-    "subset-font": "^2.3.0",
+    "subset-font": "^2.4.0",
     "svgo": "^3.3.2"
   },
   "devDependencies": {