tools: remove @bable/plugin-syntax-class-properties

ESLint 8.0.0 makes the plugin unnecessary.

PR-URL: #40394
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

.eslintrc.js

@@ -17,7 +17,6 @@ const hacks = [
   'eslint-plugin-node-core',
   'eslint-plugin-markdown',
   '@babel/eslint-parser',
-  '@babel/plugin-syntax-class-properties',
   '@babel/plugin-syntax-import-assertions',
 ];
 Module._findPath = (request, paths, isMain) => {
@@ -40,7 +39,6 @@ module.exports = {
   parserOptions: {
     babelOptions: {
       plugins: [
-        Module._findPath('@babel/plugin-syntax-class-properties'),
         Module._findPath('@babel/plugin-syntax-import-assertions'),
       ],
     },

tools/update-babel-eslint.sh

@@ -18,7 +18,7 @@ ROOT="$PWD/../.."
 NPM="$ROOT/deps/npm/bin/npm-cli.js"
 
 "$NODE" "$NPM" init --yes
-"$NODE" "$NPM" install --global-style --no-bin-links --production --no-package-lock @babel/core @babel/eslint-parser@latest @babel/plugin-syntax-class-properties@latest @babel/plugin-syntax-import-assertions@latest
+"$NODE" "$NPM" install --global-style --no-bin-links --production --no-package-lock @babel/core @babel/eslint-parser@latest @babel/plugin-syntax-import-assertions@latest
 
 # Use dmn to remove some unneeded files.
 "$NODE" "$NPM" exec -- dmn@2.2.2 -f clean