chore(deps): update dependency jest to v26

Author: renovate-bot

package.json

@@ -25,7 +25,7 @@
     "eslint-config-prettier": "6.11.0",
     "eslint-plugin-jest": "23.7.0",
     "husky": "4.2.5",
-    "jest": "24.9.0",
+    "jest": "26.4.2",
     "lint-staged": "10.2.2",
     "prettier": "2.1.0",
     "ts-jest": "25.2.1"

packages/graphql-codegen-relay-optimizer-plugin/package.json

@@ -36,7 +36,7 @@
     "@types/jest": "24.9.1",
     "@types/relay-compiler": "8.0.0",
     "graphql": "14.6.0",
-    "jest": "24.7.1",
+    "jest": "26.4.2",
     "ts-jest": "25.2.1",
     "typescript": "3.9.7"
   },