📌(deps) pin eslint to version less than 9

Eslint 9 has been recently released but some related dependencies are
not yet compatible (e.g: @typescript-eslint/parser). So we have to pin
this deps awaiting the support by other deps.

renovate.json

@@ -1,5 +1,5 @@
 {
   "extends": ["github>openfun/renovate-configuration"],
-  "ignoreDeps": ["chalk", "@storybook/builder-vite", "remark-gfm", "node"],
+  "ignoreDeps": ["chalk", "@storybook/builder-vite", "remark-gfm", "node", "eslint"],
   "ignorePaths": ["**/node_modules/**"]
 }