Update some JS dependencies (#13222)

* Update some JS dependencies

- Update selective dependencies that are compatible with webpack 4. We
can not upgrade to webpack 5 yet because `license-webpack-plugin` is
incompatible.
- Enable a few new eslint rules and fix new issues

* fix comment

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: zeripath <art27@cantab.net>

.eslintrc

@@ -99,7 +99,7 @@ rules:
   import/no-amd: [0]
   import/no-anonymous-default-export: [0]
   import/no-commonjs: [0]
-  import/no-cycle: [0]
+  import/no-cycle: [2, {ignoreExternal: true}]
   import/no-default-export: [0]
   import/no-deprecated: [0]
   import/no-dynamic-require: [0]
@@ -117,7 +117,7 @@ rules:
   import/no-self-import: [2]
   import/no-unassigned-import: [0]
   import/no-unresolved: [2, {commonjs: true}]
-  import/no-unused-modules: [0]
+  import/no-unused-modules: [2, {unusedExports: true}]
   import/no-useless-path-segments: [2, {commonjs: true}]
   import/no-webpack-loader-syntax: [2]
   import/order: [0]
@@ -211,7 +211,7 @@ rules:
   no-mixed-operators: [0]
   no-mixed-spaces-and-tabs: [2]
   no-multi-assign: [0]
-  no-multi-spaces: [2, {ignoreEOLComments: true, exceptions: {Property: true, VariableDeclarator: true}}]
+  no-multi-spaces: [2, {ignoreEOLComments: true, exceptions: {Property: true}}]
   no-multi-str: [2]
   no-negated-condition: [0]
   no-nested-ternary: [0]
@@ -336,6 +336,7 @@ rules:
   unicorn/explicit-length-check: [0]
   unicorn/filename-case: [0]
   unicorn/import-index: [0]
+  unicorn/import-style: [0]
   unicorn/new-for-builtins: [2]
   unicorn/no-abusive-eslint-disable: [0]
   unicorn/no-array-instanceof: [0]
@@ -356,11 +357,13 @@ rules:
   unicorn/no-useless-undefined: [0]
   unicorn/no-zero-fractions: [2]
   unicorn/number-literal-case: [0]
+  unicorn/numeric-separators-style: [0]
   unicorn/prefer-add-event-listener: [2]
   unicorn/prefer-array-find: [2]
   unicorn/prefer-dataset: [2]
   unicorn/prefer-event-key: [2]
   unicorn/prefer-includes: [2]
+  unicorn/prefer-math-trunc: [2]
   unicorn/prefer-modern-dom-apis: [0]
   unicorn/prefer-negative-index: [2]
   unicorn/prefer-node-append: [0]
@@ -374,6 +377,7 @@ rules:
   unicorn/prefer-spread: [0]
   unicorn/prefer-starts-ends-with: [2]
   unicorn/prefer-string-slice: [0]
+  unicorn/prefer-ternary: [0]
   unicorn/prefer-text-content: [2]
   unicorn/prefer-trim-start-end: [2]
   unicorn/prefer-type-error: [0]