test: remove codecov (#347)

removed `codecov`

Author: babblebey

package-lock.json

@@ -15,7 +15,6 @@
   "devDependencies": {
     "ava": "6.1.3",
     "c8": "10.1.2",
-    "codecov": "3.8.3",
     "prettier": "3.3.3"
   },
   "engines": {