Revert "Update dependency c8 to v11 (#588)"

This reverts commit bdda130.

Author: romainmenke

package.json

@@ -27,7 +27,7 @@
   },
   "devDependencies": {
     "ava": "^6.0.0",
-    "c8": "^11.0.0",
+    "c8": "^10.0.0",
     "eslint": "^9.28.0",
     "eslint-config-problems": "^9.0.0",
     "eslint-plugin-prettier": "^5.0.0",