Bump jstat from 1.9.2 to 1.9.5 in /packages/playground

Bumps [jstat](https://github.com/jstat/jstat) from 1.9.2 to 1.9.5.
- [Release notes](https://github.com/jstat/jstat/releases)
- [Commits](https://github.com/jstat/jstat/compare/1.9.2...1.9.5)

---
updated-dependencies:
- dependency-name: jstat
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

packages/playground/package.json

@@ -20,7 +20,7 @@
     "binary-search-tree": "0.2.6",
     "css-loader": "^6.7.1",
     "gh-pages": "3.2.3",
-    "jstat": "1.9.2",
+    "jstat": "1.9.5",
     "lenses-ppx": "6.1.10",
     "less": "3.10.3",
     "lodash": "4.17.15",