Update devDependencies (#30807)

* eslint                        ^6.8.0  →   ^7.0.0
* eslint-plugin-unicorn        ^19.0.1  →  ^20.0.0
* karma-jasmine-html-reporter   ^1.5.3  →   ^1.5.4
* lockfile-lint                 ^4.2.2  →   ^4.3.4
* rollup                        ^2.9.1  →  ^2.10.0

.eslintrc.json

@@ -43,11 +43,13 @@
     "unicorn/no-for-loop": "off",
     "unicorn/no-null": "off",
     "unicorn/no-unused-properties": "error",
+    "unicorn/no-useless-undefined": "off",
     "unicorn/prefer-dataset": "off",
     "unicorn/prefer-includes": "off",
     "unicorn/prefer-node-append": "off",
     "unicorn/prefer-node-remove": "off",
     "unicorn/prefer-number-properties": "off",
+    "unicorn/prefer-optional-catch-binding": "off",
     "unicorn/prefer-query-selector": "off",
     "unicorn/prefer-set-has": "off",
     "unicorn/prevent-abbreviations": "off"

package.json

@@ -102,10 +102,10 @@
     "bundlewatch": "^0.2.7",
     "clean-css-cli": "^4.3.0",
     "cross-env": "^7.0.2",
-    "eslint": "^6.8.0",
+    "eslint": "^7.0.0",
     "eslint-config-xo": "^0.29.1",
     "eslint-plugin-import": "^2.20.2",
-    "eslint-plugin-unicorn": "^19.0.1",
+    "eslint-plugin-unicorn": "^20.0.0",
     "find-unused-sass-variables": "^2.0.0",
     "glob": "^7.1.6",
     "hammer-simulator": "0.0.1",
@@ -119,16 +119,16 @@
     "karma-detect-browsers": "^2.3.3",
     "karma-firefox-launcher": "^1.3.0",
     "karma-jasmine": "^3.1.1",
-    "karma-jasmine-html-reporter": "^1.5.3",
+    "karma-jasmine-html-reporter": "^1.5.4",
     "karma-rollup-preprocessor": "^7.0.5",
     "linkinator": "^2.1.1",
-    "lockfile-lint": "^4.2.2",
+    "lockfile-lint": "^4.3.4",
     "node-sass": "^4.14.1",
     "nodemon": "^2.0.3",
     "npm-run-all": "^4.1.5",
     "popper.js": "^1.16.0",
     "postcss-cli": "^7.1.1",
-    "rollup": "^2.9.1",
+    "rollup": "^2.10.0",
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-istanbul": "^2.0.1",
     "serve": "^11.3.0",