Update dependencies.

package.json

@@ -34,17 +34,17 @@
   },
   "homepage": "https://github.com/trekhleb/javascript-algorithms#readme",
   "devDependencies": {
-    "@babel/cli": "^7.12.8",
-    "@babel/preset-env": "^7.12.7",
-    "@types/jest": "^26.0.16",
-    "eslint": "^7.14.0",
-    "eslint-config-airbnb": "^18.2.1",
-    "eslint-plugin-import": "^2.22.1",
-    "eslint-plugin-jest": "^24.1.3",
-    "eslint-plugin-jsx-a11y": "^6.4.1",
-    "eslint-plugin-react": "^7.21.5",
-    "husky": "^4.3.0",
-    "jest": "^26.6.3"
+    "@babel/cli": "7.12.10",
+    "@babel/preset-env": "7.12.11",
+    "@types/jest": "26.0.19",
+    "eslint": "7.16.0",
+    "eslint-config-airbnb": "18.2.1",
+    "eslint-plugin-import": "2.22.1",
+    "eslint-plugin-jest": "24.1.3",
+    "eslint-plugin-jsx-a11y": "6.4.1",
+    "eslint-plugin-react": "7.21.5",
+    "husky": "4.3.6",
+    "jest": "26.6.3"
   },
   "dependencies": {}
 }