fix: package.json & yarn.lock to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-GLOBPARENT-1016905
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2330875
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2331908
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2430337
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2430339
- https://snyk.io/vuln/SNYK-JS-NODEFORGE-2430341
- https://snyk.io/vuln/SNYK-JS-POSTCSS-5926692
- https://snyk.io/vuln/SNYK-JS-UNSETVALUE-2400660

package.json

@@ -51,7 +51,7 @@
     "compression-webpack-plugin": "^6.1.1",
     "cross-env": "^7.0.3",
     "css-loader": "^5.2.7",
-    "cssnano": "^4.1.11",
+    "cssnano": "^5.0.0",
     "detect-passive-events": "^2.0.3",
     "dotenv": "^16.0.3",
     "emoji-mart": "npm:emoji-mart-lazyload@latest",
@@ -129,10 +129,10 @@
     "tiny-queue": "^0.2.1",
     "twitter-text": "3.1.0",
     "uuid": "^8.3.1",
-    "webpack": "^4.46.0",
+    "webpack": "^5.0.0",
     "webpack-assets-manifest": "^4.0.6",
     "webpack-bundle-analyzer": "^4.6.1",
-    "webpack-cli": "^3.3.12",
+    "webpack-cli": "^4.0.0",
     "webpack-merge": "^5.8.0",
     "wicg-inert": "^3.1.2",
     "workbox-expiration": "^6.5.4",
@@ -162,7 +162,7 @@
     "react-test-renderer": "^16.14.0",
     "stylelint": "^14.14.0",
     "stylelint-config-standard-scss": "^5.0.0",
-    "webpack-dev-server": "^3.11.3",
+    "webpack-dev-server": "^4.7.3",
     "yargs": "^17.6.0"
   },
   "resolutions": {