chore: update test dependencies

Author: renovate[bot]

karma.conf.js

@@ -23,7 +23,6 @@ module.exports = function(karma) {
 
     frameworks: [
       'mocha',
-      'sinon-chai',
       'webpack'
     ],
 
@@ -48,6 +47,10 @@ module.exports = function(karma) {
       mode: 'development',
       module: {
         rules: [
+          {
+            test: /test\/globals\.js$/,
+            sideEffects: true
+          },
           {
             test: /\.bpmnlintrc$/,
             use: 'bpmnlint-loader'