Use a better maintained loader for test coverage

package.json

@@ -64,6 +64,7 @@
     "chaikin-smooth": "^1.0.4",
     "clean-css-cli": "5.2.2",
     "copy-webpack-plugin": "^8.0.0",
+    "coverage-istanbul-loader": "^3.0.5",
     "coveralls": "3.1.0",
     "eslint": "^7.2.0",
     "eslint-config-openlayers": "^15.0.0",
@@ -75,7 +76,6 @@
     "globby": "^11.0.0",
     "handlebars": "4.7.7",
     "istanbul": "0.4.5",
-    "istanbul-instrumenter-loader": "^3.0.1",
     "jquery": "3.6.0",
     "jsdoc": "3.6.6",
     "jsdoc-plugin-typescript": "^2.0.5",

test/karma.config.js

@@ -98,7 +98,7 @@ module.exports = function (karma) {
           {
             test: /\.js$/,
             use: {
-              loader: 'istanbul-instrumenter-loader',
+              loader: 'coverage-istanbul-loader',
               options: {
                 esModules: true,
               },