Update package dependencies (#267)

package.json

@@ -42,11 +42,11 @@
     "eslint": "^7.17.0",
     "eslint-plugin-github": "^4.0.1",
     "eslint-plugin-jest": "^24.1.3",
-    "jest": "^24.9.0",
+    "jest": "^26.6.3",
     "jest-circus": "^26.6.3",
     "js-yaml": "^3.14.0",
     "prettier": "^2.2.1",
-    "ts-jest": "^24.2.0",
+    "ts-jest": "^26.4.4",
     "typescript": "^4.1.3"
   }
 }