[TASK] Update build toolchain

This patch updates some tools used for our assets generation toolchain.

Most notable changes:

- Since typescript-eslint has been updated to a new major version, its
  configuration changes slightly
- TypeScript is updated to 3.9

Executed commands:

  yarn add --dev \
      "@typescript-eslint/eslint-plugin"@^3.8.0 \
      "@typescript-eslint/parser"@^3.8.0 \
      "@typescript-eslint/typescript-estree"@^3.8.0 \
      autoprefixer@^9.8.6 \
      eslint@^7.6.0 \
      grunt-eslint@^23.0.0 \
      grunt-lintspaces@^0.9.0 \
      jasmine-core@^3.6.0 \
      karma@^5.1.1 \
      karma-coverage@^2.0.3 \
      karma-jasmine@^3.3.1 \
      terser@^5.0.0 \
      typescript@~3.9.0
  grunt build

Resolves: #91952
Releases: master, 10.4
Change-Id: Ib6726998bea0faf68e71d8374ee0d729a34b0c1e
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65564
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Benni Mack <benni@typo3.org>
Reviewed-by: Benni Mack <benni@typo3.org>

Build/eslintrc.js

@@ -12,7 +12,6 @@ module.exports = {
     "@typescript-eslint"
   ],
   "rules": {
-    "@typescript-eslint/class-name-casing": "error",
     "@typescript-eslint/indent": ["error", 2],
     "@typescript-eslint/interface-name-prefix": "off",
     "@typescript-eslint/member-ordering": ["error", {
@@ -29,6 +28,12 @@ module.exports = {
         "private-instance-method"
       ]
     }],
+    "@typescript-eslint/naming-convention": ["error",
+      {
+        selector: "class",
+        format: ["PascalCase"]
+      }
+    ],
     "@typescript-eslint/no-explicit-any": "off",
     "@typescript-eslint/no-require-imports": "off",
     "@typescript-eslint/no-unused-vars": "off",

Build/package.json

@@ -22,32 +22,32 @@
     "@types/jqueryui": "^1.11.34",
     "@types/nprogress": "^0.0.29",
     "@types/requirejs": "*",
-    "@typescript-eslint/eslint-plugin": "^2.10.0",
-    "@typescript-eslint/parser": "^2.10.0",
-    "@typescript-eslint/typescript-estree": "^2.10.0",
-    "autoprefixer": "^9.7.3",
+    "@typescript-eslint/eslint-plugin": "^3.8.0",
+    "@typescript-eslint/parser": "^3.8.0",
+    "@typescript-eslint/typescript-estree": "^3.8.0",
+    "autoprefixer": "^9.8.6",
     "bootstrap-sass": "^3.4.1",
-    "eslint": "^6.7.2",
+    "eslint": "^7.6.0",
     "grunt": "~1.0.4",
     "grunt-contrib-copy": "^1.0.0",
     "grunt-contrib-imagemin": "^3.1",
     "grunt-contrib-watch": "~1.1.0",
-    "grunt-eslint": "^22.0.0",
+    "grunt-eslint": "^23.0.0",
     "grunt-exec": "^3.0.0",
-    "grunt-lintspaces": "^0.8.6",
+    "grunt-lintspaces": "^0.9.0",
     "grunt-newer": "^1.3.0",
     "grunt-npmcopy": "^0.2.0",
     "grunt-postcss": "^0.9.0",
     "grunt-sass": "^3.1.0",
     "grunt-stylelint": "^0.12.0",
     "grunt-terser": "^1.0.0",
-    "jasmine-core": "^3.5.0",
-    "karma": "^4.4.1",
+    "jasmine-core": "^3.6.0",
+    "karma": "^5.1.1",
     "karma-chrome-launcher": "^3.1.0",
-    "karma-coverage": "^2.0.1",
+    "karma-coverage": "^2.0.3",
     "karma-firefox-launcher": "^1.2.0",
     "karma-ie-launcher": "^1.0.0",
-    "karma-jasmine": "^2.0.1",
+    "karma-jasmine": "^3.3.1",
     "karma-junit-reporter": "^1.0.0",
     "karma-opera-launcher": "^1.0.0",
     "karma-requirejs": "^1.0.0",
@@ -57,7 +57,8 @@
     "postcss-banner": "^3.0.1",
     "postcss-clean": "^1.1.0",
     "stylefmt": "^6.0.0",
-    "typescript": "~3.8.2",
+    "terser": "^5.0.0",
+    "typescript": "~3.9.0",
     "typescript-eslint": "^0.0.1-alpha.0"
   },
   "scripts": {