chore(deps) update Babel and ESLint to the latest versions

.eslintrc.js

 module.exports = {
+    parserOptions: {
+        requireConfigFile: false
+    },
     'extends': [
-        'eslint-config-jitsi'
+        '@jitsi/eslint-config'
     ]
 };

package.json

     "webrtc-adapter": "8.0.0"
   },
   "devDependencies": {
-    "@babel/core": "7.5.5",
-    "@babel/plugin-proposal-class-properties": "7.1.0",
-    "@babel/plugin-proposal-export-namespace-from": "7.0.0",
-    "@babel/plugin-proposal-nullish-coalescing-operator": "7.13.8",
-    "@babel/plugin-proposal-optional-chaining": "7.2.0",
-    "@babel/preset-env": "7.1.0",
-    "babel-eslint": "10.0.1",
-    "babel-loader": "8.0.4",
-    "core-js": "2.5.1",
-    "eslint": "5.6.1",
-    "eslint-config-jitsi": "github:jitsi/eslint-config-jitsi#974ab743dde38bf2207ad4ea5e4e89cfb98517b1",
-    "eslint-plugin-import": "2.20.2",
+    "@babel/core": "7.16.0",
+    "@babel/eslint-parser": "7.16.0",
+    "@babel/preset-env": "7.16.0",
+    "@jitsi/eslint-config": "4.0.0",
+    "babel-loader": "8.2.3",
+    "core-js": "3.19.1",
+    "eslint": "8.1.0",
+    "eslint-plugin-import": "2.25.2",
     "jasmine-core": "3.5.0",
     "karma": "5.1.1",
     "karma-chrome-launcher": "3.1.0",

webpack-shared-config.js

                                 // done unnecessarily. For browsers not specified
                                 // here, the ES2015+ profile will be used.
                                 targets: {
-                                    chrome: 58,
-                                    electron: 2,
-                                    firefox: 54,
-                                    safari: 11
+                                    chrome: 80,
+                                    electron: 10,
+                                    firefox: 68,
+                                    safari: 14
                                 }
                             }
                         ]
-                    ],
-                    plugins: [
-                        '@babel/plugin-proposal-class-properties',
-                        '@babel/plugin-proposal-optional-chaining',
-                        '@babel/plugin-proposal-export-namespace-from',
-                        '@babel/plugin-proposal-nullish-coalescing-operator'
                     ]
                 },
                 test: /\.js$/