chore: update test dependencies

Author: renovate[bot]

client/package.json

@@ -88,7 +88,7 @@
     "bpmn-js-headless": "^0.1.0",
     "bpmnlint-loader": "^0.1.6",
     "case-sensitive-paths-webpack-plugin": "^2.1.2",
-    "chai": "^4.5.0",
+    "chai": "^6.0.0",
     "copy-webpack-plugin": "^13.0.0",
     "cross-env": "^10.0.0",
     "css-loader": "^7.1.2",
@@ -105,15 +105,15 @@
     "less": "^4.0.0",
     "less-loader": "^12.2.0",
     "license-webpack-plugin": "^4.0.0",
-    "mocha": "^10.8.2",
+    "mocha": "^11.0.0",
     "mocha-test-container-support": "0.2.0",
     "monaco-editor-webpack-plugin": "^7.1.0",
     "npm-run-all2": "^8.0.0",
     "puppeteer": "^24.4.0",
     "react-svg-loader": "^3.0.3",
     "react-test-renderer": "^16.14.0",
-    "sinon": "^17.0.1",
-    "sinon-chai": "^3.7.0",
+    "sinon": "^21.0.0",
+    "sinon-chai": "^4.0.0",
     "style-loader": "^4.0.0",
     "webpack": "^5.98.0",
     "webpack-cli": "^6.0.1"