Bump kinto-admin from 1.26.1 to 1.26.2 in /kinto/plugins/admin

Bumps [kinto-admin](https://github.com/kinto/kinto-admin) from 1.26.1 to 1.26.2.
- [Release notes](https://github.com/kinto/kinto-admin/releases)
- [Commits](Kinto/kinto-admin@v1.26.1...v1.26.2)

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

kinto/plugins/admin/package.json

@@ -9,7 +9,7 @@
   "dependencies": {
     "babel-polyfill": "^6.23.0",
     "codemirror": "^5.56.0",
-    "kinto-admin": "1.26.1",
+    "kinto-admin": "1.26.2",
     "react": "^16.13.1",
     "react-dom": "^16.13.1",
     "react-router": "^5.2.0",