chore(deps): update dependency @callstack/eslint-config to v15

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "@babel/preset-env": "^7.7.1",
     "@babel/preset-flow": "^7.0.0",
     "@babel/preset-react": "^7.7.0",
-    "@callstack/eslint-config": "^13.0.0",
+    "@callstack/eslint-config": "^15.0.0",
     "enzyme": "^3.10.0",
     "enzyme-adapter-react-16": "^1.14.0",
     "enzyme-to-json": "^3.4.0",