chore(deps): update dependency c8 to v9 (#843)

Author: renovate-bot

package-lock.json

@@ -74,7 +74,7 @@
     "@types/sinon": "^10.0.0",
     "@types/tmp": "^0.2.0",
     "@types/write-file-atomic": "^4.0.0",
-    "c8": "^8.0.0",
+    "c8": "^9.0.0",
     "cross-spawn": "^7.0.3",
     "fs-extra": "^11.0.0",
     "inline-fixtures": "^1.1.0",