test: bump jest

package.json

@@ -48,7 +48,7 @@
     "@rollup/plugin-json": "^4.0.0",
     "@rollup/plugin-node-resolve": "^8.0.0",
     "@rollup/plugin-replace": "^2.2.1",
-    "@types/jest": "^25.1.4",
+    "@types/jest": "^26.0.0",
     "@types/node": "13.11.1",
     "@types/puppeteer": "^2.0.0",
     "@typescript-eslint/parser": "^3.2.0",
@@ -60,7 +60,7 @@
     "eslint": "^7.2.0",
     "execa": "^4.0.2",
     "fs-extra": "^9.0.1",
-    "jest": "^25.2.3",
+    "jest": "^26.0.1",
     "lint-staged": "^10.2.10",
     "minimist": "^1.2.0",
     "npm-run-all": "^4.1.5",
@@ -73,7 +73,7 @@
     "rollup-plugin-typescript2": "^0.27.1",
     "semver": "^7.3.2",
     "serve": "^11.3.0",
-    "ts-jest": "^25.2.1",
+    "ts-jest": "^26.1.0",
     "typescript": "^3.9.3",
     "yorkie": "^2.0.0"
   }