Update dependency @testing-library/angular to v18

Author: renovate[bot]

flink-runtime-web/web-dashboard/package.json

@@ -45,7 +45,7 @@
     "@angular/cli": "21.0.1",
     "@angular/compiler-cli": "13.4.0",
     "@angular/language-service": "13.4.0",
-    "@testing-library/angular": "18.0.0",
+    "@testing-library/angular": "18.1.1",
     "@types/d3": "^7.1.0",
     "@types/dagre": "0.7.53",
     "@types/jasmine": "3.10.18",