chore(deps): update dependency c8 to v12

Author: renovate[bot]

package-lock.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "ava": "6.4.1",
-    "c8": "11.0.0",
+    "c8": "12.0.0",
     "nock": "14.0.17",
     "prettier": "3.8.5",
     "semantic-release": "25.0.9",