chore(deps): update dependency cypress to v15

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
   },
   "homepage": "https://github.com/bahmutov/tiny-blog#readme",
   "devDependencies": {
-    "cypress": "3.8.2",
+    "cypress": "15.6.0",
     "serve": "10.1.2",
     "start-server-and-test": "1.11.6"
   },