chore(deps-dev): bump testem from 3.15.2 to 3.16.0 (#1332)

Author: dependabot[bot]

package-lock.json

@@ -126,7 +126,7 @@
     "rimraf": "6.0.1",
     "sinon": "20.0.0",
     "terser-webpack-plugin": "5.3.14",
-    "testem": "3.15.2",
+    "testem": "3.16.0",
     "tslint": "=6.1.3",
     "typescript": "=5.8.3",
     "webpack": "5.99.8",